Question

calculate the number of moles of methanol in 5Lof 2m solution .If thedensity of solution is 0.981Kg/L.

Answer 1

the number of moles of 25 maternal in5l of 2m this solution Celsius - 273.0.

Answer 2

We are given the following:

Volume of solution = 5 L

Density of solution = 0.981kg/L

Molarity of solution = 2M

We can calculate the mass of the solution by using the formula:

$Mass =\text { Volume } \times Density$

$=5 L \times 0.931 k g / L=4.905\ k g=4905\ grams.$

Now, we also know that the molecular mass of methanol = 32gm

This means that for every 1000 gram of solvent, there are 2 moles of methanol

So, the mass of solution containing 2 moles of methanol

$=1000+32 \times 2=1000+64=1064\ g m$

Now, 1064 gm contains = 2 moles of methanol

$4905\ gm\ contains =\left(\frac{2}{1064}\right) \times 4905=9.21\ moles\ of\ methanol$.