Mavzu: Atomning nisbiy va absolyut massasi mavzusiga oid masalalar yechish. 1-savol

20-savol
21-savol
Temir ammoniyli achchiq toshning 2,5 mol miqdoridagi kislorod atomlari nisbiy massasini hisoblang?
Javob:
(NH4)2Fe(SO4)2 *12H2O
Topin m=n•M formula bilan
1mol ------- 20 • NA [O]
2.5 mol ----- 50•NA [O]
50•16=800 g
22-savol
Kumushning nisbiy atom massasi uglerodning nisbiy atom massasidan necha marta kam yoki ko’pligini aniqlang.
Javob:
Ag = 108gr/mol C=12gr/mol 108/12=9 marta ko’p
23-savol
Alyuminiy atomining absalut massasini (g) aniqlang.
Javob:
27gr/mol *1.66*10^-24=4.482*10^-23 a. m
24-savol
Kislarod moddasining nisbiy molekulyar massasi vodorod moddasining nisbiy molekulyar massasidan necha marta kam yoki ko’pligini aniqlang.
Javob:
O₂=16*2=32gr/mol H₂=1*2=2gr/mol 32/2=16 marta ko’p
25-savol
NxOy birikmasining 1 molida N atomlarining massasi, nisbiy atom massasidan 2 marta katta,
O atomlari soni esa N atomlari sonidan Avagadro sonicha kam bo`lsa, birikma formulasini
Aniqlang
Javob:
14x
--------2
14
28=14x X=2
2-1=1 O
N2O

Agar nisbiy atom massa birligi sifatida uglerod absolyut massasining 1/12 qismi emas, 3⁄x qismi olinsa, aluminiyning N.A.M qiymati 3 ga teng bo’ladi. “x” ning qiymatini aniqlang.

Javob:
27 gr —————3 NAM
x=9 —————1 NAM
12 ————x=4
9————-3
3/7