A reaction that is used to propel rockets is N2O4(l) + 2N2H4(l) --> 3N2(g) + 4H2

Question

A reaction that is used to propel rockets is N2O4(l) + 2N2H4(l) --> 3N2(g) + 4H2O(g). This reaction has the advantage that neither product is toxic, so no dangerous pollution is released. When the reaction consumes 10.0 g of liquid N2O4, it releases 124 kJ of heat. What is the value of ?H (in kJ per mole N2O4) for the chemical equation as written?

Explanation / Answer

A reaction that is used to propel rockets is N2O4(l) + 2N2H4(l) --> 3N2(g) + 4H2O(g)? This reaction has the advantage that neither product is toxic, so no dangerous pollution is released. When the reaction consumes 10.0 g of liquid N2O4, it releases 124 kJ of heat. What is the value of ?H (in kJ per mole N2O4) for the chemical equation as written? 1 mole of N2O4 has mass of 92.01 so in 10 g we have 10 / 92.01 moles = 0.109 moles these produce 124 kJ of heat so 1 mole will release 124 / .109 kJ / mole = 1138 kJ / mole

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