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

`0.55284g/mL`

Step-by-step explanation:

Hello there!

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

`(70gEt)/(100gSol)`

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

`12(molEt)/(1L)*(46.07 gEt)/(1molEt)=552.85g/L`

However, by taking the g/mL we obtain:

`552.84(g)/(L) *(1L)/(1000mL)=0.55284g/mL`

Which is the density of the solution.

Best regards!