17.0 g of completely vapourises at and 1 bar pressure and the enthalpy change in the process is . The enthalpy change for the vapourisation of 85 g of under the same conditions is kJ.

Question

17.0 g of  completely vapourises at  and 1 bar pressure and the enthalpy change in the process is . The enthalpy change for the vapourisation of 85 g of  under the same conditions is  kJ.

Canvas Classes · Accepted Answer

Strategy:
 Enthalpy is an extensive property. Determine the molar mass of ammonia to find the number of moles corresponding to , then scale the given molar enthalpy change.

Step 1: Find moles of 
Molar mass .
.

Step 2: Calculate total enthalpy change

.

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