4) What is the heat change when 18.6 g of Hydrogen reacts with excess O2 according to the following equation? 2H2 + O2 - H20 + 571.6kJ Classification: 5) What is the heat change when 5.81 g of graphite reacts with excess H2 according to the following equation? 6C(graphite) + 3H2 +49.03kJ → → C6H6 Classification:

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