说明： 中文教材上选出的作业习题，一般都能够在随同该教材的<释疑与习 题解析>辅助材料上得到详尽的答案解释，在此不再重新列出；对于 英文教材上选出的部分习题，也因为每年都更新，如下给出的部分 习题和答案仅供参考。 Chapter Two 6.18 The work done to compress a gas is 74J.As a result,26J of heat is given off to the surroundings.Calculate the change in energy of the gas Answer:work of compression is positive and because heat is released by the gas,q is negative.Therefore,we have A E=q+w=-26J+74J=48J. 6.56 The standard enthalpy change for the following reaction is 436.4kJ/mol: H(g)→H(g+H(g) Calculate the standard enthalpy of formation of atomic hydrogen(H) Answer: △HEm=△HmH(g】+△HmH(g] 436.4kJ/mol=2AH.m [H2(g)]-0 △Hem=218.2kJ/mol Chapter Three 13.18 consider the reaction说明： 中文教材上选出的作业习题，一般都能够在随同该教材的<释疑与习 题解析>辅助材料上得到详尽的答案解释，在此不再重新列出； 对于 英文教材上选出的部分习题， 也因为每年都更新，如下给出的部分 习题和答案仅供参考。 Chapter Two 6.18 The work done to compress a gas is 74J.As a result, 26J of heat is given off to the surroundings. Calculate the change in energy of the gas. Answer: work of compression is positive and because heat is released by the gas, q is negative. Therefore, we have △ E=q + w=-26J+74J=48J. 6.56 The standard enthalpy change for the following reaction is 436.4kJ/mol: H2(g)→H(g)+ H(g) Calculate the standard enthalpy of formation of atomic hydrogen (H). Answer: ΔHθ r, m =Δ Hθ f, m [H(g)] + Δ Hθ f, m[H2(g)] 436.4kJ/mol=2ΔHθ f, m [H2(g)]-0 Δ Hθ f, m =218.2 kJ/mol Chapter Three 13.18 consider the reaction