Which of the following are true statements for the above chemical?

Question

2H2(g) + O2(g) --> 2H2O(g) ΔH = −486.6kJ



Which of the following are true statements for the above chemical reaction ?



a) A phase change is involved


b) Two moles of hydrogen gas react with two moles of oxygen gas to
produce two moles of water vapor


c) Energy is given off to the surroundings


d) If the reaction takes place at constant volume, q and ΔH must by definition have the same value


e) ΔH for reacting four moles of hydrogen gas with two moles of
of oxygen gas is −977.2 kJ

Answer 1

a) False. All the reactants and product are gases.

b) False. One mole of oxygen gas is involved

c) True. You can tell it by the "minus" sign

d)

e) True. Multiply by two.