Kimyoning asosiy tushuncha va qonunlari nisbiy atom va nisbiy molekulyar massa. Modda miqdori

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).