Question

1.  An 8.4g sample of sodium bicarbonate is added to a solution of acetic acid weighing 20.0g. The two substances react, releasing carbon dioxide to the atmosphere. After reaction, the contents of the reaction vessel weigh 24.0g. What is the mass of the carbon dioxide given off during the reaction?

2. Is the Law of Conservation of Mass obeyed in the following experiment: 10.00g of zinc dust is mixed with 2.00 g of powdered sulfur and the mixture is heated carefully? The result is 6.08 g of white zinc sulfide and 5.92 g of unreacted zinc.

3. Is the Law of Conservation of Mass obeyed in the following experiment: 10.00g of calcium carbonate is dissolved in 100.0 mL of hydrochloric acid solution that has density of 1.148 g/mL. The products are 120.40g of solution and 2.22 L of carbon dioxide gas, which has a density of 1.9769 g/L.

4. Two unknown compounds are tested. Compound I contains 15.0 g of hydrogen and 120.0 g of oxygen. Compound II contains 2.0 g of hydrogen and 32.0 g of oxygen. Are the compounds the same?

5. When heated directly, Phosphorus reacts completely with Selenium as follows: 1.00 g of phosphorus reacts with 3.82 g of selenium to produce 4.82 g of Compound #1. When heated under carbon dioxide and nitrogen, 1.00 g Phosphorus reacts completely with 6.37 g Selenium to produce 7.37 g Compound #2. Is compound #1 the same as compound#2? Show mathematic evidence that supports your answer and identify the laws that are used

Answer 1

this is the simple ecample of law of conservation of masses. but here we have to write the complete balnced equation then only wwe will be able to tell how much much carbon di oxide left off

see image below