A balloon filled with 31.9?

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A balloon filled with 31.9?

A balloon filled with 31.9 mol helium has a volume of 715. L at 0.0°C and 1.00 atm pressure. The temperature of the balloon is increased to 68.0°C as it expands to a volume of 893. L, the pressure remaining constant. Calculate q, w, and E for the helium in the balloon. (The molar heat capacity for helium gas is 20.8 J/°C·mol.)

2007-10-26 05:30:44 · 1 answers · asked by toocool 1 in Science & Mathematics ➔ Chemistry

its wrong...:[
i just dont get it!!

2007-10-27 16:56:08 · update #1

1 answers

W = (893. L - 715. L)*1.00 atm = 178. atm·L = 18.0 kJ
E = (20.8 J/°C·mol)*31.9 mol*(68.0°C) = 45.1 kJ
Q = W + E = 63.1 kJ

2007-10-27 11:13:05 · answer #1 · answered by Hahaha 7 · 0⤊ 0⤋