Chem question, will take only two min to solve! but i can't figure it out!?

Kathryn

New member
How many grams of oxygen gas are required to produce 7.53 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water?
2 H2(g) + O2(g) -> 2 H2O(g) ?H = -484 kJ
Liquid water has a heat of vaporization of 44.0 kJ per mole at 25°C.
 
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