How many moles of C6H12 (cyclohexane) must be reacted according to the following balanced chemical reaction to transfer -419.1 kj of heat?

Question

C₆H₁₂(l) + 9O₂(g)→ 6CO₂(g) + 6H₂O(g)

∆H=-3919.4 kj

-3919.4

kJ

Answer 1

Based on the balanced chemical equation, 1 mol of C6H12 transfers -3919.4 kJ of heat (we know this because the coefficient of C6H12 in the balanced chemical equation is 1, which indicates 1 mole of C6H12).

We can then set up the following equation to determine the moles of C6H12 that must be reacted to transfer -419.1 kJ of heat:

(-3919.4 kJ)/(1 mol C6H12) = (-419.1 kJ)/(x moles C6H12)

-3919.4x = -419.1

x = 0.1069 moles of C6H12 must be reacted