The accompanying illustration depicts the structure of dimethyl terephthalate. Explanation: Dimethyl terephthalate, whose chemical formula is C6H4 (COOCH3) 2, is a diester derived from terephthalic acid and methanol. It appears as a white solid. Another method of syntheses involves p-xylene and methanol, characterized by an oxidation process followed by esterification.
Response:
A. Arginine
Clarification:
The urea cycle consists of biochemical processes that convert ammonia into urea.
Steps of the urea cycle:
- Carbamoyl phosphate reacts with ornithine transcarbamoylase to form citrulline through the release of a phosphate group along with ornithine.
- In the presence of argininosuccinate synthetase, the amino group from aspartate and the carbonyl from citrulline combine to create argininosuccinate. This reaction requires ATP.
- Subsequently, argininosuccinate is split by argininosuccinase to yield arginine and fumarate.
- Then, arginine is broken down by arginase to produce urea and ornithine. Ornithine is recycled back to mitochondria, restarting the urea cycle.
Answer:
To lower the temperature of the solution from 25.0°C to 5.0°C, it is necessary to use 35.2g of NH₄NO₃ for every 100.0g of water.
Explanation:
In order to cool down the solution, we need:
4.184 J/g°C × (5.0°C - 25.0°C) × (100.0g + X) = -Y
8368 J + 83.68 J/gX = Y (1)
Here, x represents the grams of NH₄NO₃ required, and Y represents the energy needed to remove heat.
Furthermore, the energy Y becomes:
Y = 25700 J/mol × 
X
Y = 321 J/g X (2)
Substituting (2) into (1)
8368 J + 83.68 J/g X = 321 J/g X
8363 J = 237.32 J/gX
X = 35.2g
This means 35.2g of NH₄NO₃ must be used for every 100.0g of water to achieve a temperature decrease from 25.0°C to 5.0°C.
I trust this information will be useful!
