Calculate the enthalpy change.?

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Is the answer A?

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Answer 1 · 2018-01-26T22:08:37

Yes. Prove is below.

Because ammonia has a molar mass of 17g, 15g is

#15 / 17 = 0.882# mol

The heat of fusion is -5.66 kJ per mole, so 0.882 mol would involve

#0.882 xx (-5.66) = -4.99# kJ