Please your help.. 1) When determining ?H from enthalpy of formation values, whi

Question

Please your help..

1) When determining ?H from enthalpy of formation values, which of the following should be done?

A) The enthanlpy of formation values for the products should be subtracted from the enthalpy of formation values for the reactants

B) The enthanlpy of formation values for each substance should be multiplied by their stoichiometric coefficients from the balanced equation

C) The enthanlpy of formation values for the reactants should be subtracted from the enthalpy of formation values for the products

D) The enthanlpy of formation values for each substance should be multiplied by the mass of the substance

2) For reaction, ?Hrxn = -300 kJ. If this reaction is reversed and doubled what ?Hrxn? (Do not include units with your answer)

Explanation / Answer

1)

B) The enthanlpy of formation values for each substance should be multiplied by their stoichiometric coefficients from the balanced equation

C) The enthanlpy of formation values for the reactants should be subtracted from the enthalpy of formation values for the products

2)

Hrxn = 600

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