Answer: 22: C
23: A
24: A
25: D
26: B
Explanation: I hope that this helped :)
Answer:
3.6 mol H₂
Explanation:
In order to convert from N₂ moles to H₂ moles we need to use a conversion factor. This conversion factor has to have<u> N₂ moles in the denominator and H₂ moles in the numerator</u>, using the <em>stoichiometric coefficients</em> of the reaction, as follows:
- 1.8 mol N₂ *
= 3.6 mol H₂
Answer: The thermal energy that would be released by 276.0g of sodium acetate trihydrate is 71.8kJ.
Explanation:
Supercooling is the process of lowering the temperature a liquid below its freezing point, without it becoming solid. A liquid below its freezing point will crystallize in the presence of a seed crystal because it serves as a structure for formation of crystals. From the question,
The given mass of sodium acetate trihydrate
(CH3COONa.3H2O)= 276.0g
Molar mass of sodium acetate
trihydrate= 136.08g/mol
Thermal heat of fusion of sodium acetate
trihydrate = 35.9 kJ/mol
From the given mass the number of moles present= 276.0/ 136.08
= 2.0moles
Therefore the heat (thermal) energy of the given mass of sodium acetate
trihydrate = 2.0 × 35.9
= 71.8kJ
Therefore, upon addition of a small seed crystal, the solution temperature increases as sodium acetate trihydrate crystallizes.
Answer is: molar heat of reaction of combustion of ethanol is 1237.435 kJ/mol.
m(C₂H₅OH) = 35.6 g.
n(C₂H₅OH) = m(C₂H₅OH) ÷ M(C₂H₅OH).
n(C₂H₅OH) = 35.6 g ÷ 46.07 g/mol.
n(C₂H₅OH) = 0.772 mol.
ΔT = 76.0°C - 35.0°C = 41°C.
Q = ΔT · C.
Q = 41°C · 23.3 kJ/°C.
Q = 955.3 kJ.
ΔH = Q / n(C₂H₅OH).
ΔH = 955.3 kJ / 0.772 mol.
ΔH = 1237.435 kJ/mol.
The answer is D because the order of l to g is Planet, Solar System, Galaxy and then Universe
