Calculate the molality of 2.5g of ethanoic acid in 85g of CCl4
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Explanation:
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The molar mass of ethanoic acid is 2(12)+2(16)+4(1)=60 g/mol. The mass of ethanoic acid is divided with molar mass of ethanoic acid to obtain number of moles of ethanoic acid.
Number of moles of ethanoic acid =
60g/mol
2.5g
=0.04167mol
The mass of benzene is 75 grams or
1000
75
=0.075 kg.
The molality of ethanoic acid in benzene is the ratio of the number of moles of ethanoic acid to the mass of benzene (in kg).
It is
0.075kg
0.04167mol
=0.556m
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