What is the molar mass of magnesium nitride (Mg3N2) if the molar mass of magnesium is 24.31g and nitrogen is 14.01g?
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Answer:
Explanation:
The given equation for the chemical reaction can be expressed as;
Using Hess Law to determine how much heat is produced by the decomposition of exactly 1 mole of H2O2 under standard conditions; we have the expression showing the Hess Law as follows:
At standard conditions;
the molar enthalpies of the given equation are as follows:
Replacing them into above formula; we have:
The above is the amount of heat of formation for two moles of hydrogen peroxide; thus for 1 mole hydrogen peroxide ; we have :
Hence; the heat produced after the decomposition of 1 mole of hydrogen peroxide is -54.04 kJ/mol