Worksheet-Law of conservation of mass Solve each of the following. Remember to follow rules of rounding and significant figures in your calculations. 1. In the complete reaction of 22.99 g of sodium with 3545g of chloride, what mass of sodium chloride is formed? 2. A 12.2 g sample of X reacts with a sample of y to form 78.9 g of XY What is the mass of Y that reacted? 3. A 10.0 g sample of magnesium reacts with oxygen to form 16.6 g of magnesium oxide. How many grams of oxygen reacted? 4. From a laboratory process designed to separate water into hydrogen and oxygen gas, a student collected 10.0 g of hydrogen and 79.49 of oxygen. How much water was originally involved in the process? 5. A student carefully placed 15.6 g of sodium in a reactor supplied with an excess quantity of chloride gas. When the reaction was complete, the student obtained 39.7g of sodium chloride. How many grams of chloride gas reacted? How many grams of sodium reacted? 6. In a flask 10.3 g of aluminum reacted with 100.0g of liquid bromine to form aluminum bromide. After the reaction no aluminum remained and 8.5 grams of bromine remained unreacted. How many grams of bromine reacted? How many grams of compound were formed? 7. A 3.5 kg iron shovel is left outside through the winter.The shovel, now orange with rust, is rediscovered in the spring Its mass is 3.7 kg. How much oxygen combined with the iron? 8. When 5.0g of fin reacts with hydrochloric acid, the mass of the products, tin chloride and hydrogen, totals 8.19. How many grams of hydrochloric acid were used? 9. Iron and oxygen combine to form iron oxide (rust). List the reactants and products of this reaction. 10. After burning for three hours, a candle has lost half of its mass. Explain why this example does not violate the law of conservation of mass.

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Worksheet-Law of conservation of mass Solve each of the following. Remember to follow rules of rounding and significant figures in your calculations. 1. In the complete reaction of 22.99 g of sodium with 3545g of chloride, what mass of sodium chloride is formed? 2. A 12.2 g sample of X reacts with a sample of y to form 78.9 g of XY What is the mass of Y that reacted? 3. A 10.0 g sample of magnesium reacts with oxygen to form 16.6 g of magnesium oxide. How many grams of oxygen reacted? 4. From a laboratory process designed to separate water into hydrogen and oxygen gas, a student collected 10.0 g of hydrogen and 79.49 of oxygen. How much water was originally involved in the process? 5. A student carefully placed 15.6 g of sodium in a reactor supplied with an excess quantity of chloride gas. When the reaction was complete, the student obtained 39.7g of sodium chloride. How many grams of chloride gas reacted? How many grams of sodium reacted? 6. In a flask 10.3 g of aluminum reacted with 100.0g of liquid bromine to form aluminum bromide. After the reaction no aluminum remained and 8.5 grams of bromine remained unreacted. How many grams of bromine reacted? How many grams of compound were formed? 7. A 3.5 kg iron shovel is left outside through the winter.The shovel, now orange with rust, is rediscovered in the spring Its mass is 3.7 kg. How much oxygen combined with the iron? 8. When 5.0g of fin reacts with hydrochloric acid, the mass of the products, tin chloride and hydrogen, totals 8.19. How many grams of hydrochloric acid were used? 9. Iron and oxygen combine to form iron oxide (rust). List the reactants and products of this reaction. 10. After burning for three hours, a candle has lost half of its mass. Explain why this example does not violate the law of conservation of mass.

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# Brief Explanations:The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. Therefore, the mass of the reactants equals the mass of the products.# Answer:1. In the complete reaction of 22.99 g of sodium with 35.45 g of chloride, the mass of sodium chloride formed is the sum of the masses of sodium and chloride. - **Answer:** 58.44 g2. A 12.29 g sample of X reacts with a sample of Y to form 78.99 g of XY. The mass of Y that reacted is the difference between the mass of XY and the mass of X. - **Answer:** 66.70 g3. A 10.09 g sample of magnesium reacts with oxygen to form 16.6 g of magnesium oxide. The mass of oxygen reacted is the difference between the mass of magnesium oxide and the mass of magnesium. - **Answer:** 6.51 g4. From a laboratory process designed to separate water into hydrogen and oxygen gas, a student collected 10.0 g of hydrogen and 79.4 g of oxygen. The mass of water originally involved is the sum of the masses of hydrogen and oxygen. - **Answer:** 89.4 g5. A student carefully placed 15.6 g of sodium in a reactor supplied with an excess quantity of chloride gas. When the reaction was complete, the student obtained 39.79 g of sodium chloride. The mass of chloride gas reacted is the difference between the mass of sodium chloride and the mass of sodium. - **Answer:** Chloride gas reacted: 24.19 g, Sodium reacted: 15.6 g6. In a flask, 10.3 g of aluminum reacted with 100.0 g of liquid bromine to form aluminum bromide. After the reaction, no aluminum remained and 8.5 g of bromine remained unreacted. The mass of bromine reacted is the difference between the initial mass of bromine and the unreacted bromine. The mass of the compound formed is the sum of the masses of aluminum and the reacted bromine. - **Answer:** Bromine reacted: 91.5 g, Compound formed: 101.8 g7. A 3.5 kg iron shovel is left outside through the winter. The shovel, now orange with rust, is rediscovered in the spring. Its mass is 3.7 kg. The mass of oxygen combined with the iron is the difference between the final mass and the initial mass of the shovel. - **Answer:** 0.2 kg8. When 5.09 g of tin reacts with hydrochloric acid, the mass of the products, tin chloride and hydrogen, totals 8.19 g. The mass of hydrochloric acid used is the difference between the mass of the products and the mass of tin. - **Answer:** 3.10 g9. Iron and oxygen combine to form iron oxide (rust). The reactants are iron and oxygen, and the product is iron oxide. - **Answer:** Reactants: Iron, Oxygen; Product: Iron oxide10. After burning for three hours, a candle has lost half of its mass. This does not violate the law of conservation of mass because the mass lost has been converted into gases (carbon dioxide and water vapor) and dispersed into the air. - **Answer:** The mass is conserved as it is converted into gases and dispersed.

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