Answer:
0.0067 mol/dm³Explanation:
The [H3O+] of HNO2 can be found by using the formula
[tex][H_3O^{ + } ] = \sqrt{Kac} [/tex]
Ka is the acid dissociation constant
c is the concentration of the acid
From the question we have
[tex][H3O^{ + } ] = \sqrt{4.46 \times {10}^{ - 4} \times 0.1} \\ = 0.006678...[/tex]
We have the final answer as
0.0067 mol/dm³Hope this helps you
A 24.63 gram sample of cobalt is heated in the presence of excess oxygen. A metal oxide is formed with a mass of 31.32 g. Determine the empirical formula of the metal oxide.
Explanation:
Moles of Co = 24.63 / 58.9 = 0.418
Moles of O = (31.32 - 24.63) / 16 = 0.418
Since the mole ratio is 1 : 1, the empirical formula is CoO.
The empirical formula of the metal oxide is CaO₂.
What is the empirical formula?The empirical formula is the simplest ratio of the number of atoms participating in the formation of a compound.
The chemical formula of any compound is based on two types of formula one is molecular formulas and another one is empirical formulas. Both the molecular formula and empirical formula represent the identity and number of the atom.
Given, the mass of the sample of the cobalt = 24.63g
The mass of the metal oxide = 31.32g
From the law of the conservation of mass:
The mass of the metal oxide - Mass of cobalt = mass of the oxygen
So the mass of the oxygen = 31.32 - 24.63 = 6.69 g
If mass 59 grams of the cobalt has moles = 1
Then 24.63 g of Cobalt will have moles = 24.63/59 = 0.417 mol
Similarly, 8 grams of the oxygen gas moles = 1
Then 6.69g of the oxygen has moles = 6.69/8 = 0.8362 mol
The simplest ratio of moles for Co = 0.417/0.417 = 1
For oxygen = 0.8362/0.417 = 2
Therefore the empirical formula of the metal oxide is CaO₂.
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Which of the following produces identical nuclei in cells? A pollination B miltosis C osmosis D fertilization
Answer:
Mitosis.
Explanation:
During mitosis, two nuclei must form, so that one nucleus can be in each of the new cells after the cell divides. In order to create two identical nuclei, the DNA inside of the nucleus must be copied or replicated.
1×66÷3×6666666666666
Answer: 1.4666667e+14
Explanation:
which object is a good conductor of heat and electricity?
A. rubber tires
B. rubber boots
C. metal gate
D. wooden sign
Answer:
C
Explanation:
Metals are good conductors of heat
Acetylene C2H2 gas is often used in welding torches because of the very high heat produced when it reacts with oxygen O2 gas, producing carbon dioxide gas and water vapor. Calculate the moles of carbon dioxide produced by the reaction of 1.60mol of acetylene. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.
Answer:
3.20 moles of carbon dioxide
Explanation:
The reaction of C₂H₂ with O₂ is:
C₂H₂ + 5/2O₂ → 2CO₂ + H₂O
Where 1 mole of acetylene produce 2 moles of carbon dioxide.
Based on the chemical equation of this reaction, there are produced twice the moles of acetylene in moles of carbon dioxide assuming a compete reaction.
If 1.60 moles of acetylene reacts there are produced:
1.60 moles * 2 =
3.20 moles of carbon dioxide—————————Are formed by a combination of two or more different kinds of Atom
Atom of the same ———————————-element have identical properties
Answer:
1. molecules.
2. size ,shape and mass.
NEED HELP ON 8,9,10,and 11. ONLY if you know them please.
Answer:
8: D
9: A
10: C
11: B
The largest Alkali metal is ?
Answer:
cesium is the largest alkali metal.
Explanation:
Answer:
Cesium
Explanation:
Cesium is the largest atom among alkali metal.
An atom gains two electrons. What is the overall charge now?
write the detailed structure of
A. C2H6 B. C4H10 C. C6H14 D. C7H16
A.
H₃C-CH₃
this is called ethane
B.
H₃C-CH₂-CH₂-CH₃
this is called butane
C.H₃C-CH₂-CH₂-CH₂-CH₂-CH₃
this is called hexane
D.
H₃C-CH₂-CH₂-CH₂-CH₂-CH₂-CH₃
this is called heptane
Answer:
1. a) Ethane (C2H6)
2. b) Butane (C4H10 )
3. c) Hexane (C6H14)
4. d) Heptane (C7H16)
Why halogen of vinyl chloride is inert:
Answer:
in vinyl chloride there exist a partial double bond between chlorine and carbon atoms.this partial double bond increases the strength of bond between carbon and chlorine.
Explanation:
Answer:
1-because of mesomerism in carbon-halogen bond result to formation of a degree of double bond
Explanation:
[ Methylene=CH_X ] [ (-)Methylene_CH=X(+) ]
2- their preparation from ethylene dihalide
If a gas at 315 k has a volume of 1.50 l , what is the volume of the gas when the temperature is reduced to 215 k
Answer:
1.02 L.
Explanation:
For this problem, you have to apply one of the gas laws --Charles' Law. It is as follows: V1/T1 = V2/T2. Substituting the values in and using sig figs, we get 1.02 L.
Answer:
1.02
Explanation:
In the elimination reaction of 1-bromo-2-ethylcyclohexane in sodium hydroxide in ethanol solution A) is faster for the trans isomer since the bromine and ethyl group are of different sides of the ring. B) is faster for the trans isomer since the bromine and the ethyl groups are both axial. C) is faster for the trans isomer since the bromine and the ethyl groups are both equitorial. D) is faster for the trans isomer since there is a hydrogen anti-periplanar to the bromine in the preferred chair conformer of the compound. E) None of the above provides a correct response.
Answer:
D
Explanation:
Option D is correct
Cycloalkanes(1-bromo 2-ehtyl cyclohexane is this case) mainly preferred chair conformers while undergoing elimination reaction and further products are not those that predicted by zaitsev's rule.
Hence, the correct answer is faster for the trans isomer since there is a hydrogen anti-periplanar to the bromine in the preferred chair conformer of the compound.
4. Which type of molecule forms a bilayer within a cell membrane?
Answer:
The answer is Phospholipids.
Explanation:
A phospholipid bilayer. Phospholipids spontaneously form stable bilayers, with their polar head groups exposed to water and their hydrophobic tails buried in the interior of the membrane.
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Passengers get on a plane in Phoenix at 8:00 A.M. and fly to Los Angeles and land at 8:00 A.M. How can that possible?
Answer:
Because of time zones?
Explanation: The only thing that would make sense to me is the time zones.
What is the molarity of a HCl solution that
contains 6.27 g of HCl in 163 mL of solution?
Answer in units of M.
Answer:
M = 1.04 M
Explanation:
Given data:
Molarity of solution = ?
Mass of HCl = 6.27 g
Volume of solution = 163 mL (163 mL× 1L /1000 mL = 0.163 L)
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of HCl:
Number of moles = mass/molar mass
Number of moles = 6.27 g / 36.5 g/mol
Number of moles = 0.17 mol
Molarity:
M = 0.17 mol/ 0.163 L
M = 1.04 M
Answer:
4.6 M HCI
Explanation:
on edge
By studying the distribution of different types of fossils, geologists have determined that some plates have traveled great distances. Evidence to support this comes from the fact that –
A.fossils of organisms that lived in warm climates have been found in arctic environments.
B. Species of organisms in the fossil record have changed over geologic time.
C. Some fossilized organisms have only been found on one continent.
D. The oldest known fossils, found in the deepest rock layers, represent ocean organisms.
Answer:
A. Fossils of organisms that lived in warm climates have been found in arctic environments.
Explanation:
One of the logic used by Geologists to justify plate movement over a region of space is that the fossils of organisms that lived in warm climates have been found in arctic environments.
this is as a result of plate tectonics. organisms that are well adapted to warm climates in times past have their relics preserved as fossils. their fossils are no found today around the arctic environment which are coldthis suggests that the plate must have drifted or movedWhat is the group number of the most nonmetallic group that contains metalloids?
_______________
What is the group number of the most metallic group that contains metalloids?
_______________
Answer:alkali metals group 1
Explanation:practice and get better
Define wavelength and identify TWO points that could be used in the diagram to measure it.
The moment that X-locks are released will determine A. The compliance with ACID B. The anomalies present C. X-locks are always released during commit time D. The granularity of locks
Answer:
D. The granularity of locks.
Explanation:
X-locks is one of the locks used in locking database in what is known as adaptive server. Other types of locks for locking database are the S-lock, IS-locks, and the IX- locks. The locks are used mainly for control purpose[ that is when a data is been used by a lot of people, the locks make sure that there is consistency in the data.
The option D is correct that is; ''The moment that X-locks are released will determine the granularity of the locks'' The granularity of the locks simply means the amount in which the data can be locked at the same time.
Answer:
Option D (The granularity of locks)Explanation:
The answer is Option D, The Granularity of locks:
In computer science granularity locking is a locking method used in database management systems (DBMS) and relational databases, and granularity of locks in a database refers to how much of the data is locked at one time and it is determined when S locks are released which means Shared Locks.
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How many moles of oxygen would
be consumed to produce 68.1 g
water?
Answer:
4.75 moles of oxygen would be consumed by water
Explanation:
Given data:
Mass of water produced = 68.1 g
Number of moles of oxygen consumed = ?
Solution:
Chemical equation:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 68.1 g/ 18 g/mol
Number of moles = 3.8 mol
Now we will compare the moles of water with oxygen.
H₂O : O₂
4 : 5
3.8 : 5/4×3.8 = 4.75 mol
Answer: 4.75 moles of oxygen
Explanation:
28. Describe the molecular geometry and hybridization of the N, P, or S atoms in each of the following compounds. (a) H3PO4, phosphoric acid, used in cola soft drinks (b) NH4NO3, ammonium nitrate, a fertilizer and explosive (c) S2Cl2, disulfur dichloride, used in vulcanizing rubber (d) K4[O3POPO3], potassium pyrophosphate, an ingredient in some toothpastes
Answer:
See explanation
Explanation:
The molecular geometry of an atom is connected to the number of electron pairs that surround it(whether lone pairs or bonding pairs) as well as its hybridization state. We shall now examine the N, P, or S atoms in each of the following compounds.
a)
In H3PO4, P has a tetrahedral molecular geometry and is sp3 hybridized.
b) In NH4NO3
N is sp3 hybridized in NH4^+ and sp2 hybridized in NO3^-. Also, N is tetrahedral in NH4^+ but trigonal planar in NO3^-.
c) In S2Cl2, we expect a tetrahedral geometry but as a result of the presence of two lone pairs on each sulphur atom, the molecular geometry is bent. The sulphur is sp3 hybridized.
d) In K4[O3POPO3], each phosphorus atom is in a tetrahedral molecular geometry and is sp3 hybridized.
how many atoms of San are in 0.796 moles of this element
Answer:
4.8× 10²³ atoms
Explanation:
Given data:
Number of moles of San element = 0.796 mol
Number of atoms present = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
0.796 mol × 6.022 × 10²³ atoms / 1mol
4.8× 10²³ atoms
a mixture of of sand,salt and sawdust was stirred into water and the mixture was allowed to stand.
a)how might you collect "pure" sawdust?
b)what is the sediment which forms?
c)the clear liquid was poured off and divided into 2 parts.one part was evaporated,and the other was distilled.
i)what substance would be collected by distillation?
ii)what would be collected by evaporation?
iii)what difference in properties allows the separation in both evaporation and distillation?
Answer:
A) To get the pure sawdust u can filter it..
B) The muddy sagment that will form .
C) The clear liquid can divide into 3 layers on the top there will be pure water in middle there will be muddy or dark layer of water and in lower layer there will be the stones or heavy particles of water .
In lonic bonding, atoms
share electrons
are connected by strong electrical forces
lose protons and form ions
stop moving completely
A. C5H14
B. C5H12
C. C6H14
D. C6H12
Answer:
C. C₆H₁₄
General Formulas and Concepts:
Chemistry - Atomic Structure
Writing CompoundsExplanation:
To find the molecular formula of the model, you simply count and add up the same elements together.
We see that we have 6 carbons and 14 hydrogens. Therefore our answer is C. C₆H₁₄
`Suppose you have a sample of NaOH (0.0315 L, to be exact). If this amount of NaOH is used to exactly titrate 0.0250 L of HCl that has a concentration of 0.105 M, what is the molarity of the NaOH? HINT: Remember to first get your balanced equation.
Answer:
0.0835 M
Explanation:
Step 1: Write the balanced equation
NaOH + HCl ⇒ NaCl + H₂O
Step 2: Calculate the reacting moles of HCl
0.0250 L of 0.105 M HCl react.
0.0250 L × 0.105 mol/L = 2.63 × 10⁻³ mol
Step 3: Calculate the reacting moles of NaOH
The molar ratio of NaOH to HCl is 1:1. The reacting moles of NaOH are 1/1 × 2.63 × 10⁻³ mol = 2.63 × 10⁻³ mol.
Step 4: Calculate the molarity of NaOH
2.63 × 10⁻³ moles of NaOH are in 0.0315 L of solution.
M = 2.63 × 10⁻³ mol / 0.0315 L = 0.0835 M
you take 295.5 g of a solid at 30.0 c and let it melt in 425 g of water. the water temperature decreases from 85.1 c to 30.0 c. calculate the heat of fusion of this solid
Answer:
[tex]\Delta _{fus}H=332 \frac{J}{g}[/tex]
Explanation:
Hello!
In this case, since the heat of fusion of a solid substance stands for the energy required to melt it, which is a phase transition from solid to liquid, we can see that the heat lost by water is that gained by the solid, so we can write:
[tex]Q_{solid}=-Q_{w}[/tex]
Thus, by using the water data and its specific heat (4.184), we obtain:
[tex]Q_{solid}=-m_{w}C_{w}(T_f-T_i)\\\\Q_{solid}=-425g*4.184\frac{J}{g\°C}*(30.0-85.1)\°C\\\\ Q_{solid}=97,978.82J=98.0kJ[/tex]
Next, since the heat of fusion of a substance is usually represented in terms of energy per amount of substance, we use the mass of solid to obtain:
[tex]\Delta _{fus}H=\frac{98.0kJ}{295.5g}\\\\ \Delta _{fus}H=0.332\frac{kJ}{g}=332 \frac{J}{g}[/tex]
Best regards!
The heat of fusion of the solid is 0.332 KJ/g or 332 J/g
We'll begin by calculating the heat loss by the water. This can be obtained as follow:
Mass of water (M) = 425 g
Initial temperature of water (T₁) = 85.1 °C
Final temperature (T₂) = 30 °C
Change in temperature (ΔT) = T₂ – T₁ = 30 – 85.1 = –55.1 °C
Specific heat capacity of water (C) = 4.184 J/gºC
Heat loss (Q) =?Q = MCΔT
Q = 425 × 4.184 × –55.1
Q = –97978.82 J
Divide by 1000 to express in KJ
Q = –97978.82 / 1000
Q = –97.98 KJ Finally, we shall determine the heat fusion of the solid.Heat loss by water = –97.98 KJ
Heat gained by the solid (Q) = 97.98 KJ
Mass of solid (m) = 295.5 g
Heat of fusion (Hf) =?Q = m•Hf
97.98 = 295.5 × Hf
Divide both side by 295.5
Hf = 97.98 / 295.5
Hf = 0.332 KJ/g or 332 J/gLearn more: https://brainly.com/question/15563205
If the world suffered a huge catastrophic event (an event causing great and often sudden damage or suffering; a disaster) that wiped out almost all the organisms. Who would have the best chance of repopulation the world with living organisms, an asexual reproducing organism or a sexually reproducing organism? Explain your answer.
Answer:
An asexually reproducing organism would have the best chance of repopulating the world.
Explanation:
Sexual reproduction is a method of reproduction that involves two parents and the formation and subsequent fusion of male and female gametes during fertilization. On the other hand, In asexual reproduction, only one parent is involved and produces offspring by making copies of itself through various methods such as binary fusion, budding and vegetatively.
In a case of a catastrophic event that wiped out almost all organisms, an organism that reproduces asexually have a greater chance of repopulating the world because of the following advantages in reproducing asexually:
1. Only one parent is needed, therefore reproduction is easier.
2. It isaves time and energy. Since almost all organisms have been wiped out, there is a lesser likelihood of finding a compatible mate, so reproducing asexually will give the organism a better chance.
3. It occurs at a very fast rate; much faster than sexual reproduction
4. The population can increase very quickly and colonization of new habitats is much easier.
All these advantages will give the esexually reproducig organism a fairer chance to repopulate the world.
How is the name of each element in the periodic table represented? A. The first two letters of the element's name are used for the table. B. Letters are assigned to each element by the scientist who discovered it. C. Letters are given to represent each element based on when it was discovered. D. One or two letters are used to represent the name of each element.
Answer:
D. One or two letters are used to represent the name of each element.
Explanation:
The name of each element in the periodic table is symbolized by one or two letters.
There different ways of achieving this. Sometimes;
the first letter of the name of the element is used to represent it for example, hydrogen = H the first two letters are sometimes used, for example Calcium Cathe Latin name is also used for example Gold is Aurum and is represented as Au.These are some of the ways of symbolizing the name of each element
