The first law of thermodynamics characterises the two types of energy transfer, as heat and as thermodynamic. The final internal (thermal) energy of the system is 1,500 J.
<h3>What is internal energy?</h3>
The energy present in a system itself for conducting reactions is called internal energy.
Given,
- Heat entering system (Q) = 700 J
- Work done by the piston (W) = 400
- Initial energy
= 1200 J
According to the <u>first law of thermodynamics</u>:
![\rm Q = \Delta U + W](https://tex.z-dn.net/?f=%5Crm%20Q%20%3D%20%5CDelta%20U%20%2B%20W)
Substituting values in the above equation:
![\begin{aligned}\rm Q &= \rm U_{2} - U_{1} + W\\\\\rm U_{2} &= \rm Q - W + U_{1}\\\\\rm U_{2} &= 700 - 400 + 1200\\\\&= 1500 \;\rm J\end{aligned}](https://tex.z-dn.net/?f=%5Cbegin%7Baligned%7D%5Crm%20Q%20%26%3D%20%5Crm%20U_%7B2%7D%20-%20U_%7B1%7D%20%2B%20W%5C%5C%5C%5C%5Crm%20U_%7B2%7D%20%20%26%3D%20%5Crm%20Q%20-%20W%20%2B%20U_%7B1%7D%5C%5C%5C%5C%5Crm%20U_%7B2%7D%20%20%26%3D%20700%20-%20400%20%2B%201200%5C%5C%5C%5C%26%3D%201500%20%5C%3B%5Crm%20J%5Cend%7Baligned%7D)
Therefore, option D. 1500 J is the final energy.
Learn more about internal energy here:
brainly.com/question/2602565
Answer:
The equation is: CuCO3(s) → CuO(s) + CO2(g)
Explanation:
Copper carbonate decomposes at high temperatures, generating the products carbon dioxide (CO2) and copper oxide (II) CuO. In this type of decomposition reaction, a substance is broken generating two different compounds.
So they can tell what exact species it is.
Answer:
B. gas state at room temperature
Explanation: