Variantlar – 2003 yil.
1. 6,02∙1022 ta suv molekulasining massasini va 1,505∙1024 ta suv molekulasi miqdorini aniqlang
A) 36; 0,01 B) 1,8; 2,5 C) 40; 1,0 D) 45; 0,1 E) 0,45; 10
2. Necha ml etil spirt C2H5OH (p = 0,78 g/ml)
2 mol suvga qo’shilganda hosil bo’lgan eritmada spirt molekulalarining soni suvnikidan ikki marta ko’p bo’ladi?
A) 39 B) 236 C) 59 D) 55 E) 246
3. 0,03 g suv tarkibidagi atomlar sonini toping.
A) 3 ∙1021 B) 1∙1021 C) 1,8 ∙1020
D) 1,5 ∙1022 E) 6,02 ∙1019
4. Chala kuydirib olingan gips (alebastr) – CaSO4 ∙ ½H2O ning 580 g massasidagi suvning modda miqdorini toping.
A) 0,50 B) 3,75 C) 4,0 D) 2,5 E) 2,0
5. Hajmi 0,75 l bo’lgan suvning mollar sonini hisoblang.
A) 41,7 B) 22,4 C) 13,9 D) 18 E) 9,0
6. Tabiiy suv tarkibidagi og’ir suvning miqdori 0,02% ni tashkil etsa, 500 g suvdagi og’ir suv molekulalari sonini hisoblang.
A) 6 ∙1021 B) 3 ∙1022 C) 6 ∙1022
D) 4,03 ∙1021 E) 3 ∙1021
Do'stlaringiz bilan baham: |