Henry puts 2.0 grams of baking soda into a 1.0 gram plastic bag. He then pours 5.0 grams of vinegar into the bag and immediately closes it. A reaction takes place. Henry observes a gas being produced, and the plastic bag with the baking soda and vinegar becomes cold to the touch. What will be the total mass of the bag and its contents after the reaction?
A) 6.0 grams
B) 8.0 grams
C) 5.0 grams
D) 7.0 grams
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