Answer:
mug A has more thermal energy
Explanation:
Answer: The correct option is - The reaction container is cold.
Explanation: Endothermic reaction is a reaction in which the system absorbs energy from the surroundings, generally in the form of heat.
In this process, the surrounding becomes cold after loosing energy.
And here, the surrounding is reaction container and hence, will become cold by loosing its energy to the reaction mixture.
Answer:

Explanation:
Hello,
In this case, considering that the by-mass percent of water is:

Given such percent and the mass of the sample, we can find the mass of water in grams in the sample by solving for it as shown below:

Best regards.