Question

A scientist conducts a chemical reaction. At the beginning of the reaction, she combines 5.4 grams of the first reactant and 6.3 grams of the second reactant. She runs the reaction in a closed chamber and heats only the reaction. A small amount of gas is produced. What can you conclude about the total mass of the substances present when the reaction is complete?

Answer 1

If it's in a closed chamber, the gas would not escape and the products would weigh the same as the reactant before the reaction since law of conservation of matter would take place. However, there might be an insignificant loss of the product since its difficult to measure the weight of the product in such reaction.

Step-by-step explanation:

Answer 2

The total of the mass of the substances present should be approximately equal to the sum of the mass of the reactants or 11.7 g assuming that the mas of the gas produced is negligible or very small. This is to agree the law of conservation of mass where mass cannot be created nor destroyed.