if 250 g of sodium hypochlorite is dissolved in 5 dm3 of water to prep

1.	if 250 g of sodium hypochlorite is dissolved in 5 dm3 of water to prepare a solution. calculate the concentration in moles/dm3 of the sodium hypochlorite solution
Answer» Given: 250 g of SODIUM HYPOCHLORITE is DISSOLVED in 5 dm3 of water to prepare a solution. To find: Concentration of the solution in moles/dm³ unit ? Calculation: Molecular Formula of Sodium Hypochlorite is NaClO , its MOLAR mass is (23 + 35.5 + 16) = 74.5 g/mol. Moles of Sodium hypochlorite : $\rm \therefore \: no. \: of \: moles = \dfrac{given \: mass}{molar \: mass}$ $\rm \implies\: no. \: of \: moles = \dfrac{250}{74.5}$ $\rm \implies\: no. \: of \: moles = 3.35$ Now , concentration : $\therefore \rm [NaClO] = \dfrac{moles}{volume}$ $\implies \rm [NaClO] = \dfrac{3.35}{5}$ $\implies \rm [NaClO] = 0.67 \: mol/ {dm}^{3}$ So, concentration of NaClO is 0.67 mol/dm³.