Question

The energy required for the hypothetical reaction

2A+B⇌2C+2D

is 309 kJ as written.

How much heat is absorbed when 2.60 mol of A reacts?
Express your answer to three significant figures and include the appropriate unit.

Answer 1

402 kJ

Step-by-step explanation:

Because the energy of the reaction is positive, the reaction is endothermic. This means energy is a reactant.

You can determine how much energy/heat is absorbed using the balanced chemical equation. You can convert the moles A using the ratio composed of the coefficient in front of A and the energy required for each reaction.

2A + B + 309 kJ ⇌ 2C + 2D

2.60 moles A 309 kJ
---------------------- x -------------------- = 402 kJ
2 moles A