The total mass of the bag and its contents after the reaction will remain the same as before the reaction, according to the law of conservation of mass.
Initially, the mass consists of:
- Mass of baking soda = 2.0 grams
- Mass of the plastic bag = 1.0 gram
- Mass of vinegar = 5.0 grams
Total initial mass = 2.0 grams + 1.0 gram + 5.0 grams = 8.0 grams
After the reaction, even though gas is produced and there is a temperature change (the bag feels cold), the total mass of the substances in the sealed bag will still be 8.0 grams since no mass can escape from the closed bag.
Thus, the correct answer is:
C. 8.0 grams
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