Question & Answer: Calculate the heat of formation of ammonia gas given the following information: 2NH3(l) +…..

Calculate the heat of formation of ammonia gas given the following information: 2NH3(l) + 7/2O2(g) → 2 NO2(g) + 3H2O(l) ΔH°= −700kJ ΔHf°NO2 = +33kJ/mol ΔHf°H2O = −286kJ/mol

Expert Answer

Answer

2NH3(l) + 7/2O2(g) → 2 NO2(g) + 3H2O(l) : ΔH°= −700kJ

ΔH°= ΔHf° products – ΔHf° reactants

= [(2xΔHf°NO2(g)) + ( 3 x ΔHf° H2O(l) )] – [(2xΔHf°NH3(l) ) + ( (7/2)xΔHf°O2(g))]

-700 = [(2×33)+(3x(-286))]-[(2xΔHf°NH3(l) ) +((7/2)x0) ]

(2xΔHf°NH3(l) ) = -92 kJ

ΔHf°NH3(l) = -46 kJ

ΔHf°NO2 = +33kJ/mol ΔHf°H2O = −286kJ/mol

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