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Sn + 2 Cl2 --> SnCl4
xm - 26,1 kg
2m - 0,261 kg ( masa cyny 119 g; masa chloru 35,5 *4)
x = 200m = 0,2 kilomoli
2)
2 Cu + O2 --> 2CuO
0,25 m - xg
2m - 32g
x = 4 g