Answer:
A
Explanation:
kinetic energy of a body at rest = 0
Answer:
C2H4O
two atoms of carbon four atoms of hydrogen and one atom of oxygen
Answer: 334.6 moles of O, 167.3 moles as O2
Explanation:
20.15x10^25/6.02214076x10^23 = 334.6 as atoms, 167.3 as O2
a) C₂H₄ (g) + 2Cl₂ → C₂H₂Cl₄ (l) + H₂ (g), ΔH°rxn = -385.76 kJ
ΔH°rxn = ∑ΔH°f (products) - ∑ΔH°f (reactants)
ΔH°rxn = [ΔH°f (C₂H₂Cl₄) + ΔH°f (H₂)] - [ΔH°f (C₂H₄) + 2ΔH°f (Cl₂)]
-385.76 = [ΔH°f (C₂H₂Cl₄) + 0] - [ 52.3 + 2 (0) ]
ΔH°f (C₂H₂Cl₄) = -385.76 + 52.3 = -333.46 kJ /mol
For second reaction:
C₂H₂Cl₄ (l) → C₂HCl₃ (l) + HCl (g)
ΔH°rxn = ΔH°f (C₂HCl₃ ) + ΔH°f (HCl) - ΔH°f (C₂H₂Cl₄)
= -276.2 + (-92.3) -(-333.46)
ΔH°rxn = -35.04 kJ/mol
b) C₂H₄ (g) + 2Cl₂ (g) → C₂HCl₃ (l) + H₂ (g) + HCl (g)
standard heat of reaction = ΔH°₁+ ΔH°₂
= -385.76 - 35.04 = -420.8 kJ/mol
c) Q = ΔH = -420.8 kJ/mol × 307 mol/hr = -129185 kJ/hr of heat evolved.
