Question

20. What mass of water must be added to 5g of NaCl to make 5% mass by mass percentage of the solution

Answer 1

Hey there

So the solution to your question is...

Mass of solute/Mass of solution×100

Given mass of solute= 5g of nacl
Mass of solution = mass of solute + mass of solvent
Let mass of solution be x
Therefore,
5%= 5g + x
5/100 = 5g/(5 +x)g
500 = 25 + 5x ( by cross multiply)
500-25 =5x
475= 5x
x= 475/5
x = 95g

Mass of water to be added is 95g

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Thegrandmaster