true statements?

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 absorbed by the system, the reaction species


d) If the reaction takes place at constant pressure, q = −483.6 kJ


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

Answer 1

a) false - reactants and products are all in same phase (g)

b) false - 2 mol H2, 1 mol O2, 2 mol H2O

c) false - delta H is negative so energy is released (exothermic)

d) true - delta H is the same

e) true - double the # moles doubles the energy released