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(87u-16u) ÷ 2 = 35,5u
E= Cl - chlor
Zadnie 3.
a)x- masa tlenu
7g₋₋₋₋₋₋ 14g
8g₋₋₋₋₋₋ xg
x= (8g × 14g)÷ 7g= 16g
b)16g÷1,43g/dm³=11,1888..≈11,2dm³
11.2 dm³= 11200cm³
Zadnie 4.
a)⅔ b) 23:24 c) [(23×2)÷ (3×16+ 23×2)]×100= 48,936...%≈48,94%