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Enthopy 1) A system gains heat from the surroundings and has work done on it by...

Enthopy

1) A system gains heat from the surroundings and has work done on it by the surroundings. What are the signs of qsystem and wsystem?

Answers:

qsystem<0 and wsystem>0

qsystem>0 and wsystem>0

qsystem>0 and wsystem<0

qsystem<0 and wsystem<0

2) Acetylene (C2H2) is used in welding torches. How much heat is produced if 6.55gC2H2 is combusted with excess oxygen gas?

C2H2(g)+52O2(g)⟶2CO2(g)+H2O(l)ΔH∘c=−1301.1kJ/mol

Answers

−327kJ

−8520kJ

−0.131kJ

−419kJ

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