Question

How many grams of KCN are in 10.0 ml of a 0.10 M solution?

Answer 1

Step-by-step explanation:

As it is known that molarity is the number of moles present in a liter of solution.

Mathematically, Molarity =
`(no. of moles)/(Volume in liter)`

As it is given that molarity is 0.10 M and volume is 10.0 ml. As 1 ml equals 0.001 L. Therefore, 10.0 ml will also be equal to 0.01 L.

Hence, putting these values into the above formula as follows.

Molarity =
`(no. of moles)/(Volume in liter)`

0.10 M =
`(no. of moles)/(0.01 L)`

no. of moles = 0.001 mol

As molar mass of KCN is equal to 65.12 g/mol. Therefore, calculate the mass of KCN as follows.

No. of moles =
`(mass)/(molar mass)`

0.001 mol =
`(mass)/(65.12 g/mol)`

mass = 0.06152 g

Thus, we can conclude that 0.06152 grams of KCN are in 10.0 ml of a 0.10 M solution.