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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
To determine the name of an anion, you take the name of its element and replace the end with "ide".
<h3>What is an anion?</h3>
An anion in chemistry is a negatively charged ion.
Anions are usually formed when a non-metallic atom gains electron(s).
An anion is usually named by taking the elemental name, removing the ending, and adding “ide.
Examples of anions are as follows:
- fluoride (F-)
- Chloride (Cl-)
- Iodide (I-)
Learn more about anions at: brainly.com/question/15578817
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Answer: 0.9375 g
Explanation:
To calculate the number of moles for given molarity, we use the equation:
.....(1)
Molarity of
solution = 0.75 M
Volume of
solution = 25.0 mL = 0.025 L
Putting values in equation 1, we get:
According to stoichiometry :
2 moles of
require = 1 mole of
Thus 0.01875 moles of
will require=
of
Mass of
Thus 0.9375 g of
is required to react with 25.0 ml of 0.75 M HCl