Consider the exothermic reaction 4nh3 (g) + 5o2 (g) →4no (g) + 6h2o (g) calculate the standard heat of reaction, or δh∘rxn, for this reaction using the given data. also consider that the standard enthalpy of the formation of elements in their pure form is considered to be zero.

Question

Chemistry

Kamryn Chen

17 September, 00:53

Consider the exothermic reaction 4nh3 (g) + 5o2 (g) →4no (g) + 6h2o (g) calculate the standard heat of reaction, or δh∘rxn, for this reaction using the given data. also consider that the standard enthalpy of the formation of elements in their pure form is considered to be zero.

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Jaylin Yoder · Answer 1

The first thing you need to know about this problem is that delta total = delta Hf products - delta Hf reactants.

Delta total = (4*NO + 6*H2O) - (5*O2 + 4*NH3)

Delta total = [ (4*91.3 kJ/mol) + (6*-241.8 kJ/mol.) - (5*0 kJ/mol.) + (4*-45.9 kJ/mol.)

Products = 4 * (365.2) + (-1450.8) = - 1085.6 kJ

Reactants=4 * (-45.9) + 5 * (0) = - 183.6 kJ

Delta Rxn = (-1085.6 kJ) - (-183.6 kJ) = - 902.0 kJ