Question

In the reactionN2 (gas) + O2 (gas) -------> 2NO(gas) delta H = +171KJHow much heat (KJ) is absorbed when 2.3 grams of nitrogen monoxide gas is produced?Group of answer choices4.98KJ13.3KJ6.5KJ9.74KJ2.25KJ

Answer 1

According to the given reaction, 2 moles of NO are produced.

Using the molecular mass of NO we can find the mass produced:

$2molNO\cdot\frac{30gNO}{1molNO}=60gNO$

It means that when 60g of NO are produced the heat absorbed is 171KJ.

Use this ratio to find the heat absorbed when 2.3 grams are produced:

$2.3gNO\cdot\frac{171kJ}{60gNO}=6.555kJ$

It means that the correct answer is 6.5kJ.