Chemical Reactions and Mass Conservation in Chemistry

The video tutorial covers solving problems related to mass conservation in chemical reactions. It includes examples of forming ammonia from nitrogen and hydrogen, breaking down a substance into components, combining elements X and Y, forming sodium chloride from sodium and chlorine, and forming copper sulfide from copper and sulfur. Each problem emphasizes the principle that the mass of reactants equals the mass of products.

If 28 grams of nitrogen gas react with 6 grams of hydrogen gas, what is the total mass of ammonia produced?

• 34 grams

• 6 grams

• 28 grams

• 32 grams

When a substance weighing 68 grams is heated and breaks down, what is the total mass of the resulting components?

• 34 grams

• 68 grams

• 102 grams

• 0 grams

A 13 gram sample of X combines with a 34 gram sample of Y to form XY. What is the mass of XY?

• 47 grams

• 34 grams

• 27 grams

• 13 grams

If 45.98 grams of sodium react with chlorine to form 116.89 grams of sodium chloride, how much chlorine was used?

• 70.91 grams

• 116.89 grams

• 45.98 grams

• 29.91 grams

In the reaction of copper and sulfur, if 127 grams of copper react with 41 grams of sulfur, and 9 grams of sulfur remain, what is the mass of copper sulfide formed?

• 159 grams

• 168 grams

• 127 grams

• 41 grams