Carbon tetrachloride can be formed by reacting chlorine with methane: (review Ch

Question

Carbon tetrachloride can be formed by reacting chlorine with methane: (review Chapter 8) CH_4 + 2 cl_2(g) CCL_4(g) + 2 Hz(g) Given that the heat of formation of methane is -75 kJ/mol and the heat of formation of carbon tetrachloride -135 kJ/mol, determine the heat of reaction. The Ostwald process makes nitric acid (HNO_3) from ammonia (NH_3) and oxygen(O_2) via the equation: (review Chapter 8 Hess Law) NH_3 + 2 O_2(g) rightarrow H_2O_(I) + HNO_3(g) delta H = ? Using this info: 4 NH_3(g) + 5 O_2(g) rightarrow 4 NO(g) + 6 H20(g) delta H = -1166.0 kJ/mol delta H = -348.6 kJ/mol 6 NO(g) + 3 O2(g) rightarrow 6 NO_2(g) 6 NO2(g) + 2 H_2O(g) 4rightarrow 4 HNO3(g) + 2 NO(g) delta H = + 19.4 kJ/mol Calculate the standard free energy of the following reaction from standard free energies of formation. 2 CO(g) + O_2(g) rightarrow 2 CO_2(g)

Explanation / Answer

Answer(2)

H = Heat formation of Product - Heat formation of reactant

H = Heat formation of carbon tetrachloride - Heat formation of methane

H = (-135) - (-75)

H = -60 KJ /mol

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