Question

Suppose you weighed an empty test tube first, then you weighed the test tube + cyclohexane, but forgot to weigh the entire thing again once an "unknown" was added. To rectify this mistake, you weighed the "unknown" solution after the experiment was performed. The only problem is that you forgot to wipe off the water droplets from the outside of the test tube. How would this affect your calculated value for the molar mass of the unknown? Explain.

Answer 1

Ans:- As the water droplets were not wiped away,it has got some error. Since the contribution of the water droplets to the entire mass was unknown,even it can't be determined as the weight of the droplets vary. So,the exact mass of the Unknown can't be determined.