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m O2 = 32g
32g --- 22,4 dm3
x --- 6,72 dm3
22,4x = 32*6,72
x = 9,6 g O2
1 mol O2 --- 22,4
x -- 6,72 dm3
6,72 = 22,4x
x = 0,3 mol O2
22,4 dm3 --- 6,02 * 10²³ cząsteczek
6,72 dm3 -- x
22,4x = 6,72*6,02*10²³
x = 1,806 * 10²³ cząsteczek
22,4 dm3 --- 2*6,02 * 10²³
6,72 dm3 --- x
22,4x = 12,04*6,72*10²³
x = 3,612 * 10²³ atomów O
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