A generic solid, X, has a molar mass of 80.4 g/mol. In a constant-pressure calorimeter, 16.0...

3.9 Ratings (452 Votes)

total mass of mixture = 337+16 = 353 g

initial temperature = 23 c

final temperature = 28.7 c

DT = 28.7 -23 = 5.7

heat released in the process (q) = m*s*DT

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 353*4.184*5.7

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 8.42 joule

no of mole of solid = 16/80.4 = 0.2 mole

DHsol = q/nÂ Â = 8.42/0.2 = 42.1 kj/mol

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