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masa samego węgla : 12g
więc:
12g/100g*100%= 12%
Odp. Węgiel w węglanie wapnia stanowi 12%
Pozdrawiam
100u-100%
12u-x%
x=12*100/100 = 12 u
Ca = 40u
C = 12u
O3 = 16u x 3 = 48u
40+12+48=100%
100% - 100u
x% - 12u
12*100% / 100x = 12%
C stanowi 12%.