Kimyo. Masala va mashqlar to

1.2. Natriy pirofosfatning (Na₄P₂O₇) nisbiy molekulyar massasini hisoblang. (Javob: 266 u.b.).
1.3. Natriy pirofosfat (Na₄P₂O₇·10H₂O) kristalgidratining nisbiy molekulyar massasini hisoblang. (Javob: 446 u.b.).
1.4. Vodorod atomining nisbiy atom massasini hisoblang.
Yechish. Masalani yechish uchun (1.1) formuladan foyda-lanamiz:
m.a.b.
1.5. Kislorod atomining nisbiy atom massasini hisoblang. (Javob: 16,052 m.a.b.).
1.6. Natriy atomining massasini toping.
Yechish. Masalani yechish uchun (1.1) formuladan foydalanamiz va m_x ni topamiz:
kg.
1.7. Nikel atomining massasini hisoblang.(Javob:97,99·10^-27 kg).
1.8. Temir atomining massasini hisoblang.(Javob:92,76·10^-27kg).
1.9. Azot atomining massasini hisoblang.(Javob:23,22·10^-27 kg).
1.10. Ftor atomining massasini hisoblang.(Javob:31,55·10^-27kg).
1.11. Oltingugurt atomining massasini hisoblang.
(Javob: 53,15·10^-27 kg).
1.12. 46 g massali natriyda qancha natriy moddasi bor?
Yechish. Masala (1.4) tenglama asosida yechiladi:
mol.
1.13. 4,4 g massali kalsiydagi modda miqdorini toping. (Javob: 0,11 mol).
1.14. 11,2 g massali temirda qancha temir moddasi bor?
(Javob: 0,2 mol).
1.15. 14,2 g (NH₄)₂C₂O₄.H₂O dagi modda miqdorini toping. (Javob: 0,1 mol).
1.16. 4,86 g kaliy geksaxloroplatinat (K₂PtCl₆) dagi modda miqdorini toping. (Javob: 0,01 mol).