Question

What is the possible reason for Trial B not obeying the law of conservation of mass?

A) Too much vinegar was used.
B) The reaction happened too fast.
C) Not enough baking soda was used.
D) The balloon-like device was not used in this trial.

Answer 1

I believe the answer is D. The ballon-like device was not used in this trial.

I am very sorry if this is not what you meant.