Posted by Persia on Monday, July 21, 2008 at 2:28pm.
Calculate the number of grams in a mole of C2H6, using the chemical formula and the atomic masses of C and H. It will be close to 30 g/mol.
5 g would then be about 5/30 = 1/6 mole.
Multiply the number of moles by the molar heat of vaporization, 15 kJ/mol, for the answer.
2.5
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