Practice questions in Chemistry!?

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Practice questions in Chemistry!?

Ethanol is a fuel that can be made from corn. How many kJ of heat energy are released when 3.00 kg of ethanol are burned?

C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g) H = -1406.8 kJ/mol

answer in 3 sig figs

2007-01-19 04:17:58 · 2 answers · asked by MEB 2 in Science & Mathematics ➔ Chemistry

2 answers

3.00kg = 60.0moles of ethanol
60 x 1406.8=84400kJ

2007-01-19 04:26:48 · answer #1 · answered by jonathantam1988 2 · 0⤊ 0⤋

How many moles are in 3 kg of ethanol? Now multiply moles of ethanol by kJ/ mol and you'll get how much energy is released.

2007-01-19 12:29:13 · answer #2 · answered by lynn y 3 · 0⤊ 0⤋