Question

how many moles of NaCl should be dissolved in hundred ml of water to get 0.2 M solution?​

Answer 1

No. of moles of NaCl should be equal to 0.02 mol

Explanation:

Given

molarity = 0.2 M

Volume = 100 ml ⇒ 0.100 liters

moles of NaCl = ??

Solution

as we know that

molarity = no. of moles / volume in liters

thus

0.2 M = no. of moles / 0.100 litres

no. of moles = 0.2 X 0.100

no. of moles of NaCl = 0.02 mol