Question

in a solution NaOH is 12% of total mass.its density is 1.131gram per ml.what is the value of that volume which keep 5 mole of NaOH?

Answer 1

Percent concentration by mass is defined as the mass of solute divided by the total mass of the solution and multiplied by 100%. So,
c %=m_solute/m_solution ∙100%
msolution=msolvent+msolute

The molecular weight of NaOH is 40 g/mol.
Thus, the mass of NaoH is
m_solute=40 g/mole∙5 mole=200 g
The total mass is
m_solution=(200 g)/(12 %)∙100%=1667 g
The volume is
V=ρm_solution=1.131∙1667=1885 ml

Answer: 1885 ml