Volume of air after it boils has to be calculated.

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Coal is a leading source of energy for the world. While coal is primarily composed of carbon and hydrogen, a small amount of sulfur is also present. This leads to the production of pollutants such as sulfur dioxide (SO2) through the following reaction: S(s)+O2(g)→SO2(g) A sample of coal was found to contain 1.35% sulfur by mass. If 1,250 kg of this coal were burned, what mass of sulfur dioxide could theoretically be formed (in kg)?

Answer 1

Question

Chapter 19.3, Problem 19.5E

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Interpretation:

Volume of air after it boils has to be calculated.

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Coal is a leading source of energy for the world. While coal is primarily composed of carbon and hydrogen, a small amount of sulfur is also present. This leads to the production of pollutants such as sulfur dioxide (SO2) through the following reaction: S(s)+O2(g)→SO2(g) A sample of coal was found to contain 1.35% sulfur by mass. If 1,250 kg of this coal were burned, what mass of sulfur dioxide could theoretically be formed (in kg)?

2Mg(s) + O₂(g) → 2MgO(s) A chemistry student is performing this reaction in a lab, in which magnesium is burned and combines with oxygen from the air to produce magnesium oxide. The student burns 2.92 g of Mg with oxygen from the air. The student incorrectly calculated that the mass of magnesium oxide produced was 9.69g. The work is below: 2.92 g 1 X 1 mol 24.3 g 2 mol 1 mol X 40.3 g 1 mol = 9.69g 1) What did the student do wrong? There is an error in their work. Explain specifically what part is incorrect. 2) What recommendation(s) would you give to the student regarding showing the work? There is an improvement that can be made to help the student avoid this mistake in the future. 3) Instead of 9.69g, what answer should the student have calculated?

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