Question

if the density of methanol is 0.793 kg/L ,what is its volume needed for making 2.5L of its 0.25M solution?

Answer 1

Answer on Question #43737, Chemistry, Inorganic Chemistry

Question:

if the density of methanol is 0.793 kg/L, what is its volume needed for making 2.5L of its 0.25M solution?

Solution:

2.5L of 0.25M solution contains $2.5 \times 0.25 = 0.625$ mole of methanol.

Its mass is equal to $0.625 \, \text{mol} \times 32 \, \text{g/mol} = 20 \, \text{g}$

$0.793 \, \text{kg/L} = 0.793 \, \text{g/ml}$

Now we can find needed volume:

$V(\mathrm{CH}_3\mathrm{OH}) = (20 \, \text{g}) / (0.793 \, \text{g/ml}) = 25.22 \, \text{ml}$

Answer: 25.22 ml

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