Answer:
0.15066667
I tried, hope this helps :)
Answer:
![C_{metal}=126.6\frac{J}{g\°C}](https://tex.z-dn.net/?f=C_%7Bmetal%7D%3D126.6%5Cfrac%7BJ%7D%7Bg%5C%C2%B0C%7D)
Explanation:
Hello!
In this case, when two substances at different temperature are put in contact and an equilibrium temperature is attained, we can evidence that the heat lost by the hot substance (metal) is gained by the cold substance (water) and we can write:
![Q_{metal}=-Q_{water}](https://tex.z-dn.net/?f=Q_%7Bmetal%7D%3D-Q_%7Bwater%7D)
Which can be also written as:
![m_{metal}C_{metal}(T_{EQ}-T_{metal})=-m_{water}C_{water}(T_{EQ}-T_{water})](https://tex.z-dn.net/?f=m_%7Bmetal%7DC_%7Bmetal%7D%28T_%7BEQ%7D-T_%7Bmetal%7D%29%3D-m_%7Bwater%7DC_%7Bwater%7D%28T_%7BEQ%7D-T_%7Bwater%7D%29)
Thus, since we need the specific heat of the metal, we solve for it as shown below:
![C_{metal}=\frac{m_{water}C_{water}(T_{EQ}-T_{water})}{-m_{metal}(T_{EQ}-T_{metal})} \\\\C_{metal}=\frac{250.0g*4.184\frac{J}{g\°C}(29.0\°C-98.0\°C)}{95.0g(29.0\°C-23.0\°C)} \\\\C_{metal}=126.6\frac{J}{g\°C}](https://tex.z-dn.net/?f=C_%7Bmetal%7D%3D%5Cfrac%7Bm_%7Bwater%7DC_%7Bwater%7D%28T_%7BEQ%7D-T_%7Bwater%7D%29%7D%7B-m_%7Bmetal%7D%28T_%7BEQ%7D-T_%7Bmetal%7D%29%7D%20%5C%5C%5C%5CC_%7Bmetal%7D%3D%5Cfrac%7B250.0g%2A4.184%5Cfrac%7BJ%7D%7Bg%5C%C2%B0C%7D%2829.0%5C%C2%B0C-98.0%5C%C2%B0C%29%7D%7B95.0g%2829.0%5C%C2%B0C-23.0%5C%C2%B0C%29%7D%20%5C%5C%5C%5CC_%7Bmetal%7D%3D126.6%5Cfrac%7BJ%7D%7Bg%5C%C2%B0C%7D)
Best regards.
Answer:
She can add 380 g of salt to 1 L of hot water (75 °C) and stir until all the salt dissolves. Then, she can carefully cool the solution to room temperature.
Explanation:
A supersaturated solution contains more salt than it can normally hold at a given temperature.
A saturated solution at 25 °C contains 360 g of salt per litre, and water at 70 °C can hold more salt.
Yasmin can dissolve 380 g of salt in 1 L of water at 70 °C. Then she can carefully cool the solution to 25 °C, and she will have a supersaturated solution.
B and D are wrong. The most salt that will dissolve at 25 °C is 360 g. She will have a saturated solution.
C is wrong. Only 356 g of salt will dissolve at 5 °C, so that's what Yasmin will have in her solution at 25 °C. She will have a dilute solution.