1.

1× 10²² molecules of Cuso, 51,0 was added to water and 100 g solution was obtained. % by weight of Cuso, 54,0 in the solution is (Atomic weight of Cu = 63.5)(1) 41.59 g (2) 4.1599 (3) 415.9 g (4) 24.6 g​

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