A student placed 5.0 grams of baki into a small balloon. The mass o balloon and soda was measured at grams. Next, the student poured a meas of vinegar into a Florence flask that hadam empty mass of 100 grams. After the balloon was stretched across the top of the flask, the student dumped the soda into the vinegar. A gas was formed by a chemical reaction that filled the balloon. After the reaction stopped, the student placed the flask with the filled balloon on a balance scale, and it measured 125 grams. What was the mass of the vinegar the student put in the flask at the start?