Question

which of these is a common procedural error that could make it seem like mass was not conserved? using a digital balance losing small amounts of reactant during transfer mixing all reactants in a closed container recording masses in grams

Explanation:

The law of conservation of mass states that mass is conserved in a chemical reaction. Losing small amounts of reactant during transfer can lead to an apparent loss of mass, making it seem like mass was not conserved. Using a digital balance is a proper measurement tool, mixing in a closed - container helps conserve mass, and recording masses in grams is a correct unit of measurement.

Answer:

B. Losing small amounts of reactant during transfer