Answer:
%Sgr = 1% (1 sig.fig.)
Explanation:
mass water = 350ml x 0.975g/ml = 341.25g
mass sugar added = 4g
solution mass = 341.25g + 4g = 345.25g
%sugar = (4g/345.25g)·100% = 1.1586% ≅ 1% (1 sig.fig)
The percent composition by the mass of the sugar solution is:
e. 1.16 %
This can be calculated by using mass of sugar.
Calculation of percent composition:Mass of water = 350ml x 0.975g/ml = 341.25g
Mass of sugar added = 4g
Total solution's mass = 341.25g + 4g = 345.25g
%sugar = (4g/345.25g)·100%
%sugar= 1.1586% ≅ 1.16 %
Thus, the percent composition of sugar is 1.16%. Hence, option E is correct.
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What volume, in mL, of concentrated 16 M nitric acid would you need to use in order to prepare 500.0 mL of a 0.250 M HNO3(aq) solution?
Given :
Initial concentration of nitric acid, [tex]C_1 = 16\ M[/tex].
Final concentration of nitric acid, [tex]C_2 = 0.250 \ M[/tex].
Volume of [tex]HNO_3[/tex], [tex]V _2= 500\ mL = 0.5\ L .[/tex]
To Find :
Volume needed( [tex]V_1[/tex] ).
Solution :
We know,
[tex]C_1V_1 =C_2V_2\\\\16 \times V_1 = 0.250 \times 0.5 \\\\V_1 = \dfrac{0.250 \times 0.5}{16}\\\\V_1 = 0.0078125\ L = 7.8125 \ mL[/tex]
Hence, this is the required solution.
can someone please help me with this....?
Answer:
Explanation:
The answer is D
molecular formula of alkyne containing 10 carbon atom
Answer:
Decyne: C10H18
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The general formula for alkynes is CnH2n-2
the number of carbon atoms is 10 so the number of hydrogen atoms will be 10*2-2=20-2=18hydrogen atoms
the molecular formula for this alkyne is :
C₁₀H₁₈ which is called decyne
A red laser pointer emits light at a wavelength of 488 nm. If the laser emits 7.5 10–4 J of energy per second in the form of visible radiation, how many photons per second are emitted from the laser?
a)
4.1 10–19 photons/sec
b)
5.4 10–16 photons/sec
c)
8.9 1014 photons/sec
d)
1.8 1015 photons/sec
e)
2.5 1018 photons/sec
The answer to the question, how many photons per second are emitted from the laser is d. 1.84 × 10¹⁵ photons/sec
Since the red laser pointer emits light of wavelength 488 nm, we need to find the energy of each photon from
E = hc/λ where h = Planck's constant = 6.63 × 10⁻³⁴ Js, c = speed of light = 3 × 10⁸ m/s and λ = wavelength of light = 488 nm = 488 × 10⁻⁹ m
Substituting the values of the variables into the equation, we have
E = hc/λ
E = 6.63 × 10⁻³⁴ Js × 3 × 10⁸ m/s ÷ 488 × 10⁻⁹ m
E = 19.89 × 10⁻²⁶ Jm ÷ 488 × 10⁻⁹ m
E = 0.04076 × 10⁻¹⁷ J per photon
E = 4.076 × 10⁻¹⁹ J per photon
Since the laser emits 7.5 × 10⁻⁴ J per second, the number of photons emitted from the laser per second = energy per second/energy per photon
= 7.5 × 10⁻⁴ J per second ÷ 4.076 × 10⁻¹⁹ J per photon
= 1.84 × 10¹⁵ photons/sec
The answer to the question, how many photons per second are emitted from the laser is d. 1.84 × 10¹⁵ photons/sec
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Please please please help please
Which sphere forms Earth's outermost layer?
Atmosphere
Biosphere
Cryosphere
Hydrosphere
Answer: I believe the answer is A.
Explanation: Well, the lithosphere is rocks and earth, the hydrosphere makes up all the water on Earth, the biosphere is us, (living things,) and the atmosphere is the air that surrounds us and our planet. So if you go in order, it's basically lithosphere, hydrosphere, biosphere, and then atmosphere.
Answer:
Atmosphere
Explanation:
I took test
A student predicted the reaction between hydrogen and oxygen gas would yield 125 of water. However, after measuring the water formed in the reaction, student determined that only 110 of water was actually formed. What is the percent yield of this reaction ?
Help
What is the chemical name of C4H10
Answer:
Butane
Explanation:
Answer:
Butane
Explanation:
Butane is a colorless gas with a faint petroleum-like odor.
Melting point: -138 °C
If you have 23.8g of CaCl2, how many formula units is it?
Answer:
1.3×10²³ formula unit
Explanation:
Given data:
Mass of CaCl₂ = 23.8 g
Number of formula unit = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 23.8 g/110.98 g/mol
Number of moles = 0.21 mol
1 mole of any substance contain 6.022×10²³ formula unit
0.21 mol × 6.022×10²³ formula unit / 1mol
1.3×10²³ formula unit
Please help I need this done
Answer:
they arent alcohols.
Explanation:
How does electroplating happen?
A. A thin layer of metal is removed from a cathode.
B. Metal ions form a solid layer on a metal cathode.
C. Metal on a cathode forms ions in solution.
D. Metal ions in solution form a precipitate.
(Answer is B.)
Answer:
B
Explanation:
An electroplating happen when metal ions form a solid layer on a metal cathode. Therefore, option B is correct.
What is an electroplating ?The term electroplating is defined as the process of aligning another metal on the metal. Electroplating is usually used to change the physical properties of an object.
An electroplating is accomplished by an electroplating apparatus that contain a brine solution, a battery, wires, and alligator clips that kept carbon rods attached to the metal to be electroplated and the metal to be layered.
This process is used to give objects increased wear resistance, corrosion protection or aesthetic appeal and greater thickness. While electroplating is like advanced technology. It is primarily used to change the physical properties of an object.
Thus, option B is correct.
To learn more about an electroplating, follow the link;
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