Question

What is the molarity of the aqueous solution of methyl alcohol ($C{H}_{3}OH$, molar mass 32.0 g mol${}^{-1}$) which contains 64 g of methyl alcohol in 200 g of water?

• A. 5 mol kg${}^{-1}$
• B. 10 mol kg${}^{-1}$
• C. 15 mol kg${}^{-1}$
• D. 20 mol kg${}^{-1}$

Answer 1

The correct option is B 10 mol kg${}^{-1}$

Morality $=\frac{No.ofmoles}{weightofsolvent\left(kg\right)}$

$=\frac{64\left(given\right)}{32\times 200\left(given\right)}\times 1000$

$=10molk{g}^{-1}$