Please select the word from the list that best fits the definition Vibrations that move through the ground carrying the energy r
2 answers:
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Answer : The value of for the reaction is -959.1 kJ
Explanation :
The given balanced chemical reaction is,
First we have to calculate the enthalpy of reaction .
where,
= enthalpy of reaction = ?
n = number of moles
= standard enthalpy of formation
Now put all the given values in this expression, we get:
conversion used : (1 kJ = 1000 J)
Now we have to calculate the entropy of reaction .
where,
= entropy of reaction = ?
n = number of moles
= standard entropy of formation
Now put all the given values in this expression, we get:
Now we have to calculate the Gibbs free energy of reaction .
As we know that,
At room temperature, the temperature is 500 K.
Therefore, the value of for the reaction is -959.1 kJ
The question is incomplete. Here is the complete question.
Aqueous solutions of and
, 0.10 M each, are combined. A white precipitate is observed in the container after mixing. he precipitate is filtered andcarefully rinsed with distilled water to remove other ions. A sample of the precipitate is added to 100 mL of 0.1 M NaCl. A second sample of the precipitate is then added to 100 mL of 0.1 M HCl. What would be observed in each case?
Observation upon Observation upon
addition of precipitate addition of precipitate
to NaCl(aq) to HCl(aq)
(A) additional precipitates forms no visible reaction occurs
(B) no visible reaction occurs gas is produced and some precipitate dissolves
(C) no visible reaction occurs no visible reaction occurs
(D) additional precipitates forms gas is produced and some
precipitate dissolves
Answer: (B) No visible reaction occurs; Gas is produced and some precipitate dissolves
Explanation: When aqueous solutions of and
are combined, it reacts according to the following balanced equation:
→
forming calcium carbonate (), which, as it is insoluble in water, precipitates as a solid of the color white. This process is <u>Precipitation</u> and this reaction is a <u>Precipitation</u> <u>Reaction</u>.
When calcium carbonate reacts with NaCl it produces:
→
Now, calcium chloride is an inorganic compound very soluble in water, so, in this reaction, there are no precipitate and <u>no visible reaction occurs</u>.
When reacts with hydrochloridric acid, the balanced reaction is
→
which, also produces calcium chloride and carbonic acid.
Both are soluble in water but, when carbonic acid is in an "aqueous state", carbonic acid, it dissociates, forming carbon dioxide and water. Therefore, <u>gas is produced and some precipitate dissolves</u>.
In conclusion, sentence B is the correct alternative.