28. The thermochemical equation which is associated with AH, , the standard enth

Question

28. The thermochemical equation which is associated with AH, , the standard enthalpy of formation for HClg), is a. H(g) + Cl(g) HCl(g) b. Hdg) + Cl2(g) 2HCl(g) c. ½ H2(g) + ½ Cl2(g) HCl(g) d. H2(g) + C12(1) 2HCl(g) 29. The thermochemical equation which is associated with AH, the standard enthalpy of formation for glucose, CaHiss), is a. 6C(s) + 611,0(/) C6111:Ods) b. 6 C(s) + 12H(g) + 60(g) C6H3O6(s) c. 6 C(s) + 6H2(g) t 302(g) C,H12(),(s) d. 2 C,H«OH(/) + 2 CO2(g) C61 1120n(s) e. 6E(g) + 6H2(g) + 302(g) Chi:049 30. Given the equation for the reaction. C(Hg) + 4H2(g) standard enthalpies of formation, AH CO-(g): -393.5 kJ mol CHL(g): 74.8 kJ mol Hg): -241.8 kJ mol H0(): -285.8 kJ mol what is the standard enthalpy of reaction, in kJ for the reaction shown? CH4(g)-2H20(g), and the following a. -164.9 kJ b. +76.9 k c. -164.9 kJ d. +978.3 kJ e. +995.9 kJ Given the equation for the reaction, 4 NI,(g) + 7O2(g) 4N02(g) + 6H20(g), and the following standard enthalpies of formation, AH NH (g): -80.3 kJ mol NO: (g): +33.2 kJ mol Ho0(g): -241.8 kJ mol H200): -285.8 kJ mol what is the standard enthalpy of reaction, in kJ for the reaction shown? 31. a. -172.3 k.J b.-128.3 k c. +157.5 kJ d. -996.8 kJ e. +1003.8 kJ

Explanation / Answer

28)

for delta Hf, there must be only 1 mol of product

There should be reactant in their standard state

a is wrong because standard state of hydrogen is H2

b is wrong because 2 mol of product is being formed

c is correct

d is wrong because 2 mol of product is being formed

a is wrong because standard state of Cl2 is gas

Answer: c

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