Question

1. the flask and its contents had a mass of 120 grams before the experiment. what would be the mass of the flask and its contents after the experiment?

a. 0g
b. 60g
c. 120g
d. 240g

Explanation:

Step1: Apply the law of conservation of mass

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction (assuming the flask is a closed system).

Step2: Analyze the mass before and after

Since the flask and its contents are in a closed - system (implied by the nature of the problem, as no information about mass loss/gain due to opening etc. is given), the mass of the flask and its contents after the experiment will be the same as before the experiment.

Answer:

C. 120g