At room temperature, the density if water is 1.0 g/ml and the density of ethanol is 0.789g/ml. What volume of ethanol contains the same number of molecules as are present in 175 ml of water?
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Answer:
An equal number of moles contain equal number of molecules.
mol. wt. of C
2
H
5
OH
wt. of C
2
H
5
OH
=
mol. wt. of H
2
O
wt.ofH
2
O
46
0.789× volume of C
2
H
5
OH
=
18
1.0×100
Volume of C
2
H
5
OH=
18
100
×
0.789
46
=323.9 mL.
Explanation:
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