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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEC
Chapter: Thermodynamics (C)

Olympiad workbook · NSEC · Thermodynamics (C)

Hydrazine used in rocket fuels can be obtained by the reaction of...

Hydrazine used in rocket fuels can be obtained by the reaction of ammonia and hydrogen peroxide according to the following equation

2 \mathrm{NH}_3(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}_2(\mathrm{l}) \rightarrow \mathrm{N}_2 \mathrm{H}_4(\mathrm{l})+2 \mathrm{H}_2 \mathrm{O}(\mathrm{l})

\left(\Delta \mathrm{H}^0\right.

reaction \left.=-241 \mathrm{~kJ} / \mathrm{mol}\right)

If

\Delta \mathrm{H}^0

(formation)

of \mathrm{NH}_3, \mathrm{H}_2 \mathrm{O}_2

and

\mathrm{H}_2 \mathrm{O}

are

-46.1,-187.8

and

-285.8 \mathrm{~kJ} / \mathrm{mol}

respectively,

\Delta \mathrm{H}^0

for the decomposition of hydrazine into

\mathrm{N}_2

and

\mathrm{H}_2

is

Options

A $50.6 \mathrm{~kJ} / \mathrm{mol}$
B $241 \mathrm{~kJ} / \mathrm{mol}$
C $-50.6 \mathrm{~kJ} / \mathrm{mol}$
D $120.5 \mathrm{~kJ} / \mathrm{mol}$

Correct answer

C. $-50.6 \mathrm{~kJ} / \mathrm{mol}$

Step-by-step solution

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