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Q.

17.0 g of  NH3 completely vaporizes at  33.420C and 1 bar pressure and the enthalpy change in the process is  23.4 kJ mol−1 . The enthalpy change for the vaporizationof  85 g of NH3 under the same conditions is ____kJ.

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answer is 117.

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Detailed Solution

detailed_solution_thumbnail

NH3→NH3(g)

(1)                (g)1
1 mole         1 mole
1 bar            1 bar
ΔH=23.4 kj/mole n=8517=5

For 5 mole  23.4×5=117 kj

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