The density of a 56.0% by weight aqueous solution of methanol (CH3OH) is
0.9046 g/cm3. What is the molarity of the solution?
16.8
16.4
17.0
15.1
15.8

15.8 M CH3OH

Explanation:

Molarity is measured in Moles per liter of total solution.

Here, we are given 56% weight methanol and this means 44% solvent. We can use whatever ratio we would like but just calling it out of 100 g is the easiest. This means we have 56 g of methanol and 44 g of solvent. It says aqueous, so that means the solvent is water.

First, get the moles of the solute, methanol.

(56 g) * (1 mol / 32.042 g) = 1.75 mol methanol

Second, get the total volume using the given density and the grams we chose.

(100 g) / (0.9046 g / 1 mL) = 110.55 mL

Convert to liters

= 0.111 L

Third, use these values to find molarity.

1.75 mol / 0.111 L

= 15.8 M CH3OH

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.