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1 mol--------46g Na
0.4 mol -------x
X=0.4 x 46 = ....
masa Al2S3 =2 x 27 +3 x 32 = 150g/ mol
150g Al2S3 ----------- 3mol S
75g Al2S3---------- x
x= 3 x 75 : 150
x = 1,5