Question

mole fraction of ethanol is an aqueous sample is 0.04.Molarity of solution is approximately​

Answer 1

Explanation:

mole fraction = 0.04

Let, n moles of ethanol is present.

Gram molecular mass of ethanol = 46

$\: \: \: \: \: \: \: \frac{n}{n + 55.5} = 0.04 \\ since \: value \: of \: n \: is \: very \: small \: n + 55.5 = 55.5 \\ => \frac{n}{55.5} = 0.04 \\ = > n = 2.22$

Therefore, total number of moles = 2.22 + 55.5

= 57.72

Therefore, molarity =

$\: \: \: \: \frac{57.72}{46 + 18} \\ = 0.9$

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