Ответ:

Объяснение:

1. u(Ca)= 40г/моль/42г/моль * 100% = 95.238%

u(H2) = 2/42 * 100% = 4.762%

2. u(Na) = 46/62 * 100% = 74.194%

u(O2)= 16/62 * 100% = 25.806%

3. u(MgO) = 24/40 * 100% = 60%

u(O2) = 16/40 * 100% =  40%

4. u(Cu) = 64/135 * 100% = 47.407%

u(Cl2) = 71/135*100% = 52.593%

5. U(K)= 78/94* 100% = 82.979%

u(O2) = 16/94* 100%= 17.021%

6.u(S) = 32/64 * 100% = 50%

u(O2)=32/64 * 100%= 50%