Determine the mass of sulfur that reacts without residue with iron filings weighing 2.8 kg if in this case the chemical elements Fe and S are combined in mass ratios of 7: 4
m (Fe): m (S) = 7: 4
m (Fe) = 2.8 kg
m (S) -?
1) Find the mass of the substance S:
To do this, it is necessary to make a proportion: if 7 parts of Fe react with 4 parts of S, then 2.8 kg of Fe react with (x) kg of S;
7 – 4
2.8 – x
x = 2.8 * 4/7 = 1.6;
m (S) = x = 1.6 kg.
Answer: The mass S is 1.6 kg.
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