Question

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

Answer 1

Density = mass/ volume
$molarity = no. \: of \: mole \: \div volume \: of \: solution$
Hence, . 25=no. Of mole/2.5
No. Of mole is 62.5

$mass \: = 6.25 \times 28 \\ .793 = 6.25 \times 28 \div volume$