HELP ASAP! PLEASE PLEASE PLEASE Suppose a reaction begins with 54 molecules of B2 and 126 molecules of A2 which react as completely as possible according to the equation B2 + 3 A2 --> 2 BA3. How many B2 molecules will be present in the container at the end of the reaction?

Explanation:

For one B2 molecule 3 A2 molecules are reacting means,

the ratio is  1:3

Out of 126 molecule = 126/3 =42 molecules are required for the reaction,

therefore the 54-42= 10 molcules of B2 will reamin in the  end of reaction.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error