Clarissa is conducting an experiment. She carefully measures out 15g of baking soda into a bag. She then carefully measures out 25ml of vinegar (which is equal to 25g), pours the vinegar into the bag and immediately seals it. She then watches bubbles start to form and the bag fills up with gas. According to the law of conservation of mass, how much should the bag weigh after the reaction is finished? 10g
40g
25g
15g