1×10^22 molecules of Cuso4.5H2o was added to water and 100g solution was obtained % by weight of Cuso4.5H2O in the solution is (Atomic weight of Cu = 63.5)
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Solution
moles of CuSO4.5H2O=10^22/6.023*10^23
MASS OF CuSO4.5H20=10^22*249.5/6.023*10^23 =4.14g ( molar mass of CuSO4.5H2O=249.5)
w/w%=4.14*100/100=4.14%