Thermochemistry help please, urgent...?

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Thermochemistry help please, urgent...?

How many energy is required for the decomposition of 5.0 g of H20 (l) at 1 atm and 25 C into its gaseous elements, given the following reaction:

H2(g) + 1/2 O2 (g) ----> H20 (l) enthalpy = -286 KJ

THANK u... please show the working as well...

2007-06-09 15:32:12 · 1 answers · asked by NG Yut Sei 1 in Science & Mathematics ➔ Chemistry

1 answers

The heat value of -286 KJ is the energy per mole. Divide the 5.0 g by the molecular mass of water and you have the moles. Multiply by the heat pe mole and you are done.

2007-06-09 15:48:54 · answer #1 · answered by reb1240 7 · 0⤊ 0⤋