10%mass by mass solution of CuSo4 means
a-10g of CuSo4 dissolved in 10g of water
b-10g of CuSo4 dissolved in 100g of water
c-10g of CuSo4 dissolved in 90g of water
d-1g of CuSo4 dissolved in 10g of water
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b-10g of CuSo4 dissolved in 100g of water
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