# Determine the mass of sulfur that reacts without residue with iron filings weighing 2.8 kg

September 30, 2021 | education

| **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**

Given:

m (Fe): m (S) = 7: 4

m (Fe) = 2.8 kg

Find:

m (S) -?

Solution:

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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