A student reports the following measurements for a set of pennies: 102.0mL, 91.0 g. What is the density of the pennies.
1 answer:
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Answer: Option (a) is the correct answer.
Explanation:
Enthalpy is defined as the total amount of heat present in a system.
When there is bond formation in a chemical reaction then it means energy is released. Hence, the reaction is exothermic in nature and < 0 or negative.
On the other hand, when breaking of bonds occurs then energy is absorbed by the system. Hence, the reaction is endothermic in nature and > 0 or positive.
Thus, in the given reaction , the state is changing from liquid to solid.
This means atoms are coming close to each other and hence, there is occurrence of bond formation. As a result, energy will be released to the surroundings.
Hence, we can conclude that H < 0 for the given reaction.