Question

A certain solution is 70% ethanol and the rest being distilled water. If there are 12 moles of ethanol per litre of solution, find the density of the solution.​

Answer 1

Answer:

$0.55284g/mL$

Explanation:

Hello there!

In this case, given the by-mass percent of ethanol:

$\frac{70gEt}{100gSol}$

It is possible to compute the density by using its molar mass to find the grams in one liter of solution:

$12\frac{molEt}{1L}*\frac{46.07 gEt}{1molEt}=552.85g/L$

However, by taking the g/mL we obtain:

$552.84\frac{g}{L} *\frac{1L}{1000mL}=0.55284g/mL$

Which is the density of the solution.

Best regards!