Homework Help: Chemistry

Posted by Luke on Sunday, November 7, 2010 at 2:37pm.

For the reaction:
CH4(g) + 2O2(g)-->CO2(g)+2H2O (l)
ÄH = -50.38 kJ/mol,

How many moles of methane (CH4) must be burned to produce 137 kJ of heat?

Chemistry - kyle, Sunday, November 7, 2010 at 3:19pm
For each mole of CH4 reacted there is 50.38 kj released.

137 kj * (1 mol/50.38 kj) = 2.719 moles of CH4. 4 sig figs

additional info: 50.38 is positive because it's asking how much heat is produced (released) and if you say -50.38 kj is released it's like a double negative.

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