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M Al = 27g g/mol
M S = 32g g/mol
1 mol Al2S3 = 150g
0,6 mola Al2S3 = x g
x = 90g Al2S3
w 150g Al2S3 --- jest 54g (2 atomy glinu, czyli 2*27=54g) Al
w 90g Al2S3 ----- jest x g Al
x = 32,4g Al
w 150g Al2S3 ------ jest 96g S (3 atomy siarki, czyli 3*32=96g)
w 90g Al2S3 ------ jest x g S
x = 57,6 g S
1 mol Al = 27g
x mola Al = 32,4g
x = 1,2 mola Al
1 mol S = 32g
x mola S = 57,6g
x = 1,8 mola S
Odp. 1,2 mola Al i 1,8 mola S jest w 0.6 mola Al2S3.