1.A 25% aceticaeif solution mean's
i) 25 ml alcohol in 100 ml of water
ii) 25 ml of acetic acid 100 ml of water
111) 25 g of acetic acid in 75 ml of water
iv) 25 ml of acetic acid in 75 ml of water
a) i and i
b) üi and iv c) iii only
d) iv only
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Answer: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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