chemistry molarity

Question

if you want to make a 0.696 M solution using 6.96 g of sodium hydroxide, how many milliliters does the solution need to occupy?

Answer 1

molar mass of sodium hydroxide = (23 + 16 + 1) g/mol = 40 g/mol

number of moles = mass/molar mass = 6.96/40 = 0.174 mol

Volume = number of moles/concentration = 0.174/0.696 = 0.25 L = 0.25 * 1000mL/1L = 250 mL