Отыскать 15 формул и посчитать их молекулярную массу

1. Н2O Mr = 1 * 2 + 16 = 18;

2. H2SO4 Mr = 1 * 2 + 32 + 16 * 4 = 98;

3. HCl Mr = 1 + 35.5 = 36.5;

4. CaO Mr = 40 + 16 = 56;

5. Са(OH)2 Mr = 40 + 16 * 2 + 1 * 2 = 74;

6. H3PO4 Mr = 1 * 3 + 31 + 16 * 4 = 98;

7. SO2 Mr = 32 + 16 * 2 = 64;

8. Fe2O3 Mr = 56 * 2 + 16 * 3 = 160;

9. Na2SO4 Mr = 23 * 2 + 32 + 16 * 4 = 142;

10. HNO3 Mr = 1 + 14 + 16 * 3 = 63;

11. AlCl3 Mr = 27 + 35.5 * 3 = 133.5;

12. KOH Mr = 39 + 16 + 1 = 56;

13. KMnO4 Mr = 39 + 55 + 16 * 4 = 158;

14. AgNO3 Mr = 108 + 14 + 16 * 3 = 170;

15. MgSO4 Mr = 24 + 32 + 16 * 4 = 120.