"H_2+\\frac{1}{2}O_2 \\to H_2O"
"\u2206H=-241.8kJ"
So:
"241.8kJ" are produced from "1 mole = 2g H_2"
So "-155kJ" produced from
"\\frac{2}{241.8}\u00d7155=1.282grams"
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