Question

When making a molar liquid solution from a dry chemical stock you must know the molecular weight of the compound. True or false?

Answer 1

Answer: True

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

$Molarity=\frac{n}{V_s}$

where,

n= moles of solute

$Moles=\frac{\text{Given mass} of solute}{\text{Molar mass of the solute}}$  

$V_s$ = volume of solution in L

$Molarity=\frac{\text {given mass of solute}}[\text {molecular mass of solute} times V_s}$

Thus when making a molar liquid solution from a dry chemical stock you must know the molecular weight of the compound.