Question

What is the molarity of a 0.45 % (m/v) NaCl?

Answer 1

this statement states that 0.45 gm of NaCl is present in 100 ml of solution.
no. of moles of NaCl=`0.45/58.5=0.007` moles
`Molarity=0.007/100*1000=0.07M`