What mass of sodium hydroxide is required in 150 g of water to make 40% concentration of solution?
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The molar mass of NaOH is 40 g/mol.
The number of moles of NaOH is equal to the ratio of its mass to molar mass.
The number of moles of NaOH =40g/mol40g=1mol
The molarity of NaOH solution is the ratio of number of moles of NaOH to total volume of solution in L.
M=1L1mol=1M
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