Answer:
D
Explanation:
a solution containing 1.00 g of an unknown nonelectrolyte liquid and 9.00 g of water has a freezing point of -3.33 *C. Calculate the molar mass of the unknown liquid in g/mol.
The depression in freezing point of water here is 3.33 °C. Then the molality of the solution is 1.79. From number of moles of solute is calculated as 0.0161. Then , the molar mass of the solute is 62.11 g.
What is depression in freezing point ?The addition of a non-volatile salt into a solvent will decrease the freezing point of the solution than the pure solvent. The change in freezing point is proportional to the molality of the solution.
ΔTf = Kf m
Kf is called molal depression constant.
Kf for water = 1.86 °C Kg/mol
given ΔTf = 3.33 (0 - (-3.33))
then m = ΔTf /Kf = 3.33/ 1.86 °C Kg/mol = 1.79
Now, mass of water= 9 g = 0.009 kg
then number of moles = molality × mass of solvent
n = 0.009 kg × 1.79 = 0.0161.
mass of solute taken = 1 g
then, molar mass = 1/0.0161 = 62.11 g.
Therefore, the molar mass of the solute is 62.11 g.
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What is the mass of 5 moles of al2o3? (Show work please)
Answer: 509.8 g
Explanation:
5 moles Al₂O₃
Al: 2 x 26.98 g = 53.96 g
O: 3 x 16.00 g = 48.00 g
Total grams = 101.96 g
1 mole of Al₂O₃ = 101.96 g
5 mol Al₂O₃ x (101.96 g Al₂O₃/1 mol Al₂O₃) = 509.8 g Al₂O₃
Note that moles of Al₂O₃ cancel and you are left with grams, which is what you want.
Which of the following chemicals is an example of a perovskite that would be used in a perovskite solar cell?
Answer:
CH3NH3Pbl3
Explanation:
is an example of a perovskite th that would be used in a perovskite solar cell
Holide Perovskite
A 3.5-L sample of helium gas, collected at 0.00°C and 1.00 atm, is compressed into a 0.50-L cylinder. What pressure will the gas exert in the cylinder at 39.1°C?
The pressure of a gas is directly proportional to its temperature and inversely proportional to its volume.
PV/T = PV/T
(1.00atm * 3.5 L)/ 273k = (P * 0.50L)/(39.1 + 273k)
Do some simple algebra and you will get
P = 8.0 (Note that there should be 2 sigfigs)
arrange tha following substances in order of increasing boiling point and increasing solubility in water. -2-butanol ,-2-propanol,-2-methylpropane, -2-pentanol
Answer:
Here is the order of increasing boiling point and increasing solubility in water for the substances you listed:
-2-Methylpropane < -2-butanol < -2-pentanol < -2-propanol
Explanation:
-2-Methylpropane has the lowest boiling point and is the least soluble in water.
-2-butanol has a higher boiling point than -2-methylpropane, but lower than -2-pentanol and -2-propanol
-2-pentanol has a higher boiling point than -2-butanol and -2-methylpropane, but lower than -2-propanol
-2-propanol has the highest boiling point and is the most soluble in water.
Please note that this is a general trend and there can be variations depending on factors such as pressure, purity of the substance, and temperature.
Glucose (C6H12O6) is burned in the human body for energy. Carbon dioxide and water are produced as waste products. How many moles of oxygen are needed to combust 3.12 moles of glucose?
18.72 moles of oxygen are needed to combust 3.12 moles of glucose.
Glucose is a type of sugar that can be represented by the chemical formula C6H12O6.
When glucose is burned in the human body, it combines with oxygen to form carbon dioxide (CO2) and water (H2O) as waste products.
The balanced equation for the combustion of glucose is:
C6H12O6 + 6O2 -> 6CO2 + 6H2O
From the equation, we can see that for every 1 mole of glucose, 6 moles of oxygen are needed.
To calculate the number of moles of oxygen needed to combust 3.12 moles of glucose, we can use this relationship;-
3.12 moles of glucose * 6 moles of O2/1 mole of glucose = 18.72 moles of O2
So, 18.72 moles of oxygen are needed to combust 3.12 moles of glucose.
Calculate to the correct number of significant figure (1.7x10^6)/(2.63x10^2) + 7.33 =
Answer: 64.7 [tex]*10^2[/tex]
Explanation:
Significant figures are the number of digits in a value that correlate with the accuracy of that value.
First lets solve the equation:
(1.7x10^6)/(2.63x10^2) + 7.33 = ?
(1,700,000)/(263) + 7.33
(6,463.8783) + 7.33 = 6,471.2083
We have to simplify the answer to the correct amount of significant digits.
6,471.2083 -> 64.7 [tex]*10^2[/tex]
Step 7: Put the metal in the water and measure temperature changes (Copper)
Initial temperature of metal
=
°C
Initial temperature of water
=
C
Final temperature of both =
DONE
Below is a list of the temperature change solution.
Temperature Change: What Is It?The source of the temperature change is
Initial Temperature - Final Temperature
Temperature measurements
It is a gauge for determining how hot or chilly a body is.
To quantify temperature variations,
The water and iron's beginning and final temperatures are noted.
To Iron
Iron that has been heated up is submerged in water.
Water is at a lower temperature, so both of the temperatures will change.
These information is saved.
Final temperature minus initial temperature equals temperature change.
a) The difference in temperature for metal is 200 - 100 = 100 0C
Water temperature change = 22.5
Change in temperature for both = 23.3
b) 0.7 for water
Metal 76.6 for iron
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Complete Question -
Put the Metal in the Water and Measure
Temperature Changes (Lead)
Measure the initial temperature of the water to the
nearest 0.1°C. Record in the data table.
Initial temperature of metal =
Initial temperature of water
Final temperature of both = [
27
DONE
26
25
24
23
Intro
Continue
AL
250 ml
=பா-©
200
150
100
1
27
O
°C
°C
Topic 2: The Concepts
3. Explain heat of reaction in your own words. Recall the definitions of exothermic
and endothermic. How would you know if a reaction were exothermic or
endothermic? Label each of the reactions you observed as either one.
I
Chemical reactions that release heat energy are called exothermic reactions. example:
What is exothermic and endothermic reaction?C(g)+O2(g)→CO2(g)+thermal energy. A chemical reaction that absorbs heat energy is called an endothermic reaction. example:
CaCO3Heat→CaO+CO2.
A chemical reaction or physical change is endothermic when the system absorbs heat from the environment. In an endothermic process, the system gains heat from the environment and reduces the temperature of the environment.
A chemical reaction that releases energy is called exothermic. In an exothermic reaction, more energy is released in forming bonds within the products than is expended in breaking bonds within the reactants. Chemical reactions that absorb (or consume) energy are called endothermic.
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calculate the change in enthalpy for the chlorination of propane
A thermodynamic system's property called enthalpy is the result of adding the internal energy of the system and the product of its pressure and volume.
How is the change in enthalpy Illustrated?The change in enthalpy for a chemical reaction, also known as the heat of reaction or delta H, is the amount of heat absorbed or released during the reaction at a constant pressure. To calculate the change in enthalpy for the chlorination of propane, you would need to know the enthalpies of formation for the reactants and products, and use the following equation:
ΔH = ΣΔHf (products) - ΣΔHf (reactants)
Where ΔHf is the enthalpy of formation for a given substance.
Without knowing the specific conditions and reactants, it's not possible to give a exact delta H value for the chlorination of propane. But it's an exothermic process, meaning that heat is released during the reaction. The magnitude of the heat released will depend on the specific reactants and conditions used.
Note that an overview was given as the information is incomplete.
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A pharmacy technician measures the mass of a pill. The mass of one pill is 697 mg. What is the mass in kilograms of 100 pills? Write your answer as a decimal
The mass in kilograms of 100 pills is equal to 0.0697 kilograms.
What is a conversion factor?In Science, a conversion factor can be defined as a number that is typically used to convert (change) a number in one (1) set of units to another, either by dividing or multiplying.
Generally speaking, an appropriate conversion factor to an equal value must be used when it is necessary to perform any mathematical conversion.
Conversion:
1 pill = 697 milligrams.
100 pills = X milligrams.
Cross-multiplying, we have:
Mass of X in milligrams (mg) = 697 mg × 100 pills
Mass of X in milligrams (mg) = 69700 mg.
Next, we would convert the unit of mass in milligrams (mg) to kilograms (kg) by dividing it with a conversion factor of 1 × 10⁶ as follows;
Mass of X in kilograms (kg) = 69700/(1 × 10⁶)
Mass of X in kilograms (kg) = 0.0697 kilograms.
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Calculate to the correct number of significant figures (85.3-21.489)/0.0059
Answer:
11000
Explanation:
85.3 has 3 significant figures
21.489 has 5 significant figures
0.0059 has 2 significant figures ( as zeros on the left are not significant)
The answer is always rounded off to the least number of decimal places given in the question. Here the least number is two significant figures.
Therefore;
(85.3 - 21.489)/0.0059
= (63.811)/0.0059
= 10815.42
As we have to round off the answer to two significant figures:
= 11000
If 1 gram of radium decays to 1/2 gram in 1622 Years so, 6 grams decay to 3 grams in
a)9732 years
b) 3244 years
c) 4866 years
d) 1622years
Answer:
Explanation:
Since 1 gram of radium decays to 1/2 gram in 1622 years that means the half-life of radium is 1622 years.
So, 6 grams also decay to 3 grams in 1622years
What mass of HNO3 was contained in the solution if 35
cm3. of 0,4 N was required to neutralize it? NaOH solution?
What is the titer of a NaOH solution?
(Answer: 0,882 g, 0,016 g/
cm³.)
The mass of the HNO3 solution was found to be 0.882 g and the titer of the NaoH solution was 0.016g/cm^3.
what was NaoH ?
The inorganic chemical sodium hydroxide, widely known as lye and caustic soda, has the formula NaOH. It is a white solid ionic compound that contains sodium cations Na+ and hydroxide anions OH.
Sodium hydroxide is a caustic base and alkali that degrades proteins at room temperature and can inflict serious chemical burns. It collects moisture and carbon dioxide from the air and is extremely soluble in water. It creates a succession of NaOHnH2O hydrates. Between 12.3 and 61.8 °C, the monohydrate NaOHH2O crystallises from water solutions. This monohydrate is frequently used in commercially available "sodium hydroxide," and published data may refer to it instead of the anhydrous component.
As one of the most basic hydroxides, sodium hydroxide is commonly employed in conjunction with neutral water.
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Which weighs more, a mole of lead or a mole of helium?
The mass of one mole of lead is 207.2 g and that of helium is just 4 g/mol. Therefore, a mole of lead weighs more than a mole of helium.
What is one mole ?A mole is a unit of measurement that represents the amount of substance in a sample. One mole of any substance contains the same number of particles, which is known as Avogadro's number (6.022 x 10²³ particles per mole). Mass of one mole of an element is called its atomic mass.
The atomic mass of lead is 207.2 g/mol, which means that one mole of lead has a mass of 207.2 grams. The atomic mass of helium is 4.0 g/mol, which means that one mole of helium has a mass of 4.0 grams.
Therefore, a mole of lead weighs more than a mole of helium, since the molar mass of lead is much greater than that of helium.
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50 cm³ of 0.50 M sulphuric acid is added to 50 cm³ of 0.10 M sodium hydroxide in a calorimeter. A maximum rise in temperature of 6.8 °C is observed.
a. Calculate the standard enthalpy of neutralization of sulphuric acid and sodium hydroxide. (Ans: −57.12 kJ mol−1)
b. Give reason why the value obtained in (a) is less than the expected value.
Answer:
a. To calculate the standard enthalpy of neutralization of sulphuric acid and sodium hydroxide, we can use the formula:
ΔH_neutralization = q_calorimeter / n_reactant
where q_calorimeter is the heat absorbed or released by the solution and n_reactant is the number of moles of reactant.
First, we need to calculate the heat absorbed or released by the solution using the equation:
q_calorimeter = mcΔT
where m is the mass of the solution, c is the specific heat capacity of the solution and ΔT is the change in temperature.
In this case, the mass of the solution is 50 cm³ + 50 cm³ = 100 cm³. The specific heat capacity of the solution is approximately 4.18 J/g°C. The change in temperature is 6.8°C.
q_calorimeter = (100 cm³) (4.18 J/g°C) (6.8°C) = 28.624 J
Then we need to calculate the number of moles of reactant used. The acid is sulfuric acid and the base is sodium hydroxide.
H2SO4 + 2NaOH -> Na2SO4 + 2H2O
The balanced equation shows that 1 mole of H2SO4 reacts with 2 moles of NaOH.
n_reactant = (50 cm³)(0.50 M) + (50 cm³)(0.10 M) = 2.5 moles
Therefore, the standard enthalpy of neutralization of sulphuric acid and sodium hydroxide is:
ΔH_neutralization = q_calorimeter / n_reactant = (28.624 J) / (2.5 moles) = -11.4496 kJ/mol
b. The value obtained in (a) is less than the expected value because heat exchange occurs between the reaction mixture and the calorimeter, which causes a loss of energy. Additionally, the solution may not have been perfectly insulated and heat may have been lost to the surroundings, also causing a loss of energy. Furthermore, the reaction may not have been performed under standard conditions, such as at a specific temperature or pressure.
The following table lists molar concentrations of seven major ions in seawater. Using a density of 1.022 g/ml. for seawater, convert the concentrations
for the two ions in the question below into molality.
The sodium ion:
The sulfate ion:
The molality of the sodium ions and the sulfate ions are 44.5 and 10.66 respectively.
How do you calculate molality?
The total number of moles of solute per litre of solution is defined as the molarity of a specific solution. Because, unlike mass, the volume of a system changes with changes in physical circumstances of the system, the molality of a solution is reliant on changes in physical qualities of the system such as pressure and temperature. M, which stands for molarity, represents molarity. The molarity of a solution is one molar when one gramme of solute is dissolved in one litre of solution. As we know, the solvent and solute combine to create a solution, hence the total volume of the solution is measured.
molality of sodium was
=480.57/10.781
=44.5
molality of sulfate was
=28.93/2.712
=10.66
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Make two molecules of water without any leftovers, what is the result?
To create molecules, atoms combine. Two hydrogen (H) atoms and one oxygen (O) atom make up a water molecule's three atoms. H2O is a common abbreviation for water because of this.
EXAMPLES OF MOLECULES AND WHAT A MOLECULE IS:The smallest unit of a material that keeps its content and characteristics is a molecule, which is made up of two or more atoms linked together by chemical bonds. The building blocks of chemistry are molecules.
What exactly are fundamental molecules?The phrase "the molecules of life" frequently refers to these four categories of molecules. Proteins, carbohydrates, lipids, and nucleic acids make up the four basic building blocks of life. Every single life on Earth depends on one or more of the four categories. These four molecules are necessary for a cell and an organism to exist.
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A cylinder with a movable piston contains 7.00 moles of helium. What is the final amount of moles in the cylinder if the volume was changed from 8.00 L to 12.7 L? (Don't forget to check that your units are correct).
30 points
For a cylinder containing 7.00 grams of helium and a moveable piston. If the capacity was adjusted from 8 l to 12.7 l, the ultimate quantity of moles inside the cylinder would be 11.110 l.
Describe a cylinder?
The three-dimensional shape of a cylinder is made up of two parallel round base connected by a curved surface. The right cylinder is formed when the circular bases' centres cross each other. Right cylinders have parts that are parallel to the planes that include the bases; otherwise, they are referred to as oblique cylinders.
A round cylinder is what?
The circular cylinder is a cylinder with circular bases that are parallel to one another. Three dimensions are involved.
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Which example is a biotic factor of an aquarium environment?
Responses
amount of oxygen in the water
water temperature
amount of sand in the aquarium
number of underwater plants
To solve this we must be knowing each and every concept related to environment. Therefore, the correct option is option B among all the given options.
What is environment?An environment may be simply defined as a system that includes all abiotic and biotic components that have an impact on human life. All flora and animals are considered biotic, or living, elements, whereas water, sunshine, air, temperature, etc. are considered abiotic.
Any good, service, or feature that benefits people and society might be considered one of an environment's resources. They might be anything that fulfills a person's requirements on a daily basis. Amount of oxygen in the water is a biotic factor of an aquarium environment.
Therefore, the correct option is option B.
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Answer: B: Water Temperature
Explanation: k12 test 1.04 Science Life semester 2
Nitrogen gas reacts with hydrogen gas to produce ammonia according to the following equation: N2(g)+3H2–>2NH3(g)
What is the mass of ammonia produced from 6.5 grams of hydrogen reactant, assuming there is a sufficient nitrogen to react? Give an explanation
a. 4 g NH3
b. 8 g NH3
c. 37 g NH3
d. 55 g NH3
As per the balanced reaction, 3 moles or 6 g of hydrogen gas produces 2 moles or 34 g of ammonia. Then, 6.5 g of hydrogen produces 36.8 g of ammonia.
What is ammonia ?Ammonia is a covalent compound formed from the nitrogen atom and three hydrogen atoms. The process of manufacturing of ammonia is called Haber process.
As per the balanced reaction, 3 moles or 6 g of hydrogen gas produces 2 moles or 34 g of ammonia. Then, 6.5 g of hydrogen produces 36.8 g of ammonia.
The mass of ammonia produced from 6.5 g of hydrogen is calculated as follows:
mass of ammonia = (6.5 × 34 g) / 6 g = 36.8 g
Therefore, the mass of ammonia produced from 6.5 g of hydrogen gas is 36.8 g.
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Compare the reactivity of Magnesium with the metals in Group 1 and explain the differences in their reactivity ( based on their properties and chemical structure )
Magnesium is less reactive than the elements of group 1.
What is reactivity?Before we get into the question, it is good that we know what we mean by reactivity in chemistry. When we use the term reactivity, we are trying to look at how two or more substances can be able to combine together.
We know that the reactivity of the metals would depend on the position of the metals in the electrochemical series as well as the position of the metal in the perioidic table of the elements.
Given that the atoms of the elements that we have in group 1 are more electro positive than magnesium, they are going to be much more reactive than the element magnesium and this is evidence by the reduction potentials of the elements that we can easily see from the standard tables.
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When a solution goes through a flame test, a lilac flame is produced, and the solution does not react with NaOH or NH3. When mixed with silver nitrate, a cream colored precipitate is formed. Determine the name and formula for the compound in this solution.
Answer: Potassium bromide, KBr
Explanation:
Potassium gives a lilac flame in flame test and Bromide ions produce a cream precipitate when they react with Silver ions to form Silver bromide
list three statements for transverse waves
Students in Ms. Brown’s class are on a field trip at the zoo. They observe the following biotic and abiotic factors in the zoo:
Rocks
Water
Trees
Grass
Monkeys
Birds
Ms. Brown would now like them to make a list of all the factors in the zoo ecosystem. Which of the items should be included on their list?
trees and grass
monkeys and birds
rocks, water, and trees
All abiotic and biotic factors of the zoo are part of the ecosystem.
Answer:
All abiotic and biotic factors of the zoo are part of the ecosystem.
Explanation:
An ecosystem is composed of all the living and non-living things in a particular area, and how they interact with one another. All the items listed, including rocks, water, trees, grass, monkeys, and birds, are part of the zoo ecosystem as they interact with each other and the environment.
Please help with the following problem attached!!
2.27x1022 molecules of CH4 contains 2.27x1022 moles of CH4 and 8.9x1022 moles of hydrogen atoms.
What is hydrogen atoms?Hydrogen atoms are the simplest atoms, consisting of a single proton and electron. They are the smallest and most abundant atoms in the universe, making up about 75% of all matter. Hydrogen atoms are also the most reactive elements, easily combining with other elements to form molecules, such as water. They are an essential part of many biochemical reactions, and are used in fuel cells to generate electricity. Hydrogen atoms are also important in astronomy, as they are a key component of stars and other cosmic bodies. Hydrogen atoms are also a major component of the Earth's atmosphere, making up about 20% of the air we breathe. In summary, hydrogen atoms are a vital part of the universe and are essential to life as we know it.
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CALCULATE THE [H3O+] FOR A URINE SAMPLE, WHICH HAS A PH OF 7.5
use the formula [H3O+] = 10^-pH
plug in the pH [H3O+] = 10^-7.5
so [H3O+] = 3.162*10^-8 M
A gold bullion dealer advertised a bar of pure gold for sale. The gold bar had a mass of 3300 g and measured 2.00 cm x 15.0 cm x 6.00 cm. Calculate the density of the bar. Was the bar pure gold? (Hint: The density of pure gold is 19.3 g/cm3)
The denstiy of the gold bar of mass 3300 g is 18.3 g/cm³.
What is density?Density is the ratio of mass and volume.
To calculate the density of the bar gold, we use the formula below.
Formula:
D = m/lwh........................ Equation 1Where:
D = Densitym = Massl = Lengthw = Widthh = HeightFrom the question,
Given:
m = 3300 gl = 2 cmw = 15 cmh = 6 cmSusbtitute these values into equation 1
D = (3300)/(2×15×6)D = 18.3 g/cm³The bar is not a pure gold.
Hence, the denstiy is 18.3 g/cm³.
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if 6.0 g of carbon is heated in air the mass of the products obtained could be either 22.0 of 14.0 G depending on the amount of air present what law will be in accordance with ( c=12, o=16)
Answer: There is a law
Explanation: This law says if the thing that you throwing could be more height depend how is its volume of mass
3) What mass of ethanol could burn in 100 g of oxygen? C2H5OH + 3 02 2 CO2 + 3 H2O
