27. Determine the enthalpy change, AH, for the reaction, CS() + 30, colg) + 2SMO

Question

27. Determine the enthalpy change, AH, for the reaction, CS() + 30, colg) + 2SMO, given the following thermochemical equations: C(s) + O2(g) CO2(g) AlH- -296.8k AH 87.9 kJ c(s) + 2S(s) CS2(1) a. +778.2 kJ b. -602.4 kJ c.-1075 kJ d. -778.2 kI e. +602.4 k3 28. The thermochemical equation which is associated with AH, the standard enthalpy of formation for a, H(g) + Cl(g) HCl(g) 29. The thermochemical equation which is associated with AlHl; the standard enthalpy of formation for glucose, CsH120s(s), is b. 6 C(s) 12H(g) + 60(g) + Cali,o(s) 30. Given the equation for the reaction, CO2(g) + 4Hag) CH4(g) + 2H20(g), and the following standard enthalpies of formation, AH CO.(g):-393.5 kJ mol CH(g): -74.8 kJ mol H:O(g): -241.8 kJ mol H-0(D): -285.8 kJ mol what is the standard enthalpy of reaction, in kJ for the reaction shown? 6-6 a. -164.9 kJ b. +76.9 k c.-164.9 kJ d. +978.3 kJ e. +995.9 kJ 3 l. Given the equation for the reaction, 4 NH(g) + 7O2(g) 4NOdg) + 6Htrg. and the following standard enthalpies of formation, 1e : NH, (g): -80.3 kJ mol NO2 (g): +33.2 kJ mol H,0(g): -241.8 kJ mol H O(0): -285.8 kJ mol what is the standard enthalpy of reaction, in kJ for the reaction shown? a. -172.3 kJ b. -128.3 k.J c. +157.5 k d. -996.8 k e. +1003.8 kJ

Explanation / Answer

27)

let us number the reactions as 0,1,2,3 from top to bottom

reaction 0 can be written as: reaction 1 + 2*reaction 2 - reaction 3

so,

H0 = H1 + 2*H2 - H3

= (-393.5) + 2*(-296.8) - (87.9)

= -1075 KJ

Answer: c

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