Question

students placed baking soda and vinegar in a closed flask. the reaction produced bubbles of carbon dioxide gas. they measured the total mass of the flask and its contents before and after the reaction.
which data set best supports the law of conservation of mass?

Explanation:

Step1: Recall law of conservation of mass

The law of conservation of mass states that in a closed - system, the total mass before a chemical reaction is equal to the total mass after the reaction.

Step2: Analyze each data set

For data set A, mass before = 50 g and mass after = 47 g. Since 50≠47, it does not support the law.
For data set B, mass before = 50 g and mass after = 50 g. As 50 = 50, it supports the law.
For data set C, mass before = 50 g and mass after = 52 g. Since 50≠52, it does not support the law.
For data set D, mass before = 50 g and mass after = 48 g. Since 50≠48, it does not support the law.

Answer:

B. 50, 50