Answer:
Q = 669.44 J
Explanation:
Given that,
Mass of water, m = 32 g
The temperature change from 25.0°C to 20.0°C.
We need to find the amount of heat energy transferred. Let it is Q. We know that,
![Q=mc\Delta T](https://tex.z-dn.net/?f=Q%3Dmc%5CDelta%20T)
Where
c is the specific heat of water
Put all the values,
![Q=32\times 4.184 \times (20-25)\\Q=669.44\ J](https://tex.z-dn.net/?f=Q%3D32%5Ctimes%204.184%20%5Ctimes%20%2820-25%29%5C%5CQ%3D669.44%5C%20J)
So, 669.44 J of heat energy is transferred from the water.
Element. It is the simplest form of pure substance. They cannot be broken into anything else by physical or chemical means.
Answer:
No digestion occurs in the esophagus. After passage through the esophagus, the bolus will enter the stomach and undergo mechanical and chemical digestion. Mechanical digestion in the stomach occurs via peristaltic contractions of the smooth muscle from the fundus towards the contracted pylorus, termed propulsion.
Explanation:
i hope it's help
Answer: The specific heat capacity of the sample is
and as heat is released in this reaction so it is exothermic in nature.
Explanation:
Given: Mass = 120.4 g
Heat energy released = -7020 J
Initial temperature =
Final temperature =
Formula used is as follows.
where,
q = heat energy
m = mass of substance
C = specific heat capacity
= initial temperature
= final temperature
Substitute the values into above formula as follows.
![q = m \times C \times (T_{2} - T_{1})\\-7020 J = 120.4 g \times C \times (90.5 - 25.7)^{o}C\\C = \frac{-7020 J}{120.4 \times (-64.8^{o}C)}\\= \frac{7020 J}{7801.92} J/g^{o}C\\= 0.899 J/g^{o}C](https://tex.z-dn.net/?f=q%20%3D%20m%20%5Ctimes%20C%20%5Ctimes%20%28T_%7B2%7D%20-%20T_%7B1%7D%29%5C%5C-7020%20J%20%3D%20120.4%20g%20%5Ctimes%20C%20%5Ctimes%20%2890.5%20-%2025.7%29%5E%7Bo%7DC%5C%5CC%20%3D%20%5Cfrac%7B-7020%20J%7D%7B120.4%20%5Ctimes%20%28-64.8%5E%7Bo%7DC%29%7D%5C%5C%3D%20%5Cfrac%7B7020%20J%7D%7B7801.92%7D%20J%2Fg%5E%7Bo%7DC%5C%5C%3D%200.899%20J%2Fg%5E%7Bo%7DC)
When heat is released in a process or reaction then it means it is exothermic in nature.
Thus, we can conclude that the specific heat capacity of the sample is
and as heat is released in this reaction so it is exothermic in nature.
Answer:
387 g/mol
Explanation:
The molar mass is a ratio comparing a substance's mass and molar value. The specific ratio looks like this:
Molar Mass (g/mol) = mass (g) / moles
You can plug the given values into the ratio to find the molar mass.
Molar Mass = mass / moles
Molar Mass = 0.406 g / 0.00105 mol
Molar Mass = 387 g/mol