Which answer best describes the transfer of heat that occurs when 1.71 mol of h2 reacts with 0.814 mol of o2?

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Chemistry

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6 October, 20:02

Which answer best describes the transfer of heat that occurs when 1.71 mol of h2 reacts with 0.814 mol of o2?

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Daniella Ward · Answer 1

The reaction between H2 and O2 to form water can be shown as below:

2H2 (g) + O2 (g) → 2H2O (l)

This is an exothermic reaction where the enthalpy change (heat released) = - 484 kJ

Here we have 1.71 moles of H2 reacting with 0.814 moles of O2. Since moles of O2 < moles of H2, the former will be the limiting reagent.

Since the heat transferred by 1 mole of O2 is - 484 kJ,

The heat corresponding to 0.814 moles of O2 would be

= 0.814 moles O2 * - 484 kJ / 1 mole O2 = - 393.97 kJ

Ans: Heat transfer = - 394 kJ