Homework Answers
Molar mass of C2H5OH,
MM = 2*MM(C) + 6*MM(H) + 1*MM(O)
= 2*12.01 + 6*1.008 + 1*16.0
= 46.068 g/mol
mass(C2H5OH)= 3.585 g
use:
number of mol of C2H5OH,
n = mass of C2H5OH/molar mass of C2H5OH
=(3.585 g)/(46.07 g/mol)
= 7.782*10^-2 mol
Q = -106.0 KJ
delta H = Q / number of mol
= -106.0 KJ / ( 7.782*10^-2 mol)
= -1362 KJ/mol
Answer: -1362 KJ/mol
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