chemistry problem please help?

deisel

New member
2 H2(g) + O2(g) 2 H2O(l) ΔH = -572 kJ

How much heat is evolved when 4.77 g of hydrogen is reacted with excess oxygen?

How much heat is evolved when 226 g of oxygen is reacted with excess hydrogen?

The total volume of hydrogen gas needed to fill the Hindenburg was 2.0 multiplied by 108 L at 1.0 atm and 25°C. How much heat was evolved when the Hindenburg exploded, assuming all the hydrogen reacted?

thanks
 
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