Chemistry 30 Thermodynamics

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Thermodynamics

Assignment 4: Entropy

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1.	Predict (do not calculate) whether ΔS will be positive or negative , and explain your answer:
	A.	6 CO_{2 (g)} + 6 H₂O _(l) → C₆H₁₂O_{6 (s)} + 6 O_{2 (g)}
	B.	PCl_{3 (l)} + Cl_{2 (g)} →PCl_{5 (s)}
	C.	H₂O _(g) → H_{2 (g)} + ½ O_{2 (g)}
2.	Calculate ΔS using values from the Thermochemical Data handout
	A.	4 Fe _(s) + 3 O_{2 (g)} → 2 Fe₂O_{3 (s)}
	B.	C₂H_{4 (g)} + 3 O_{2 (g)} → 2 CO_{2 (g)} + 2 H₂O_(l)
	C.	H_{2 (g)} + Br_{2 (l)} → 2 HBr _(g)
	D.	Na _(s) + ½ Cl_{2 (g)} → NaCl _(s)
	E.	C₂H_{6 (g)} + 3½O_{2 (g)} → 2 CO_{2 (g)} + 3 H₂O _(l)