A.) The reaction is Exothermic
A. ca is the answer because its short for carbon
Answer:
A.
Explanation:
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Answer : The correct option is, 0.21 moles
Solution : Given,
Molarity of the solution = 0.85 M = 0.85 mole/L
Volume of solution = 250 ml = 0.25 L ![(1L=1000ml)](https://tex.z-dn.net/?f=%281L%3D1000ml%29)
Molarity : It is defined as the number of moles of solute present in one liter of the solution.
Formula used :
![Molarity=\frac{\text{moles of solute}}{\text{Volume of solution in liters}}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7B%5Ctext%7Bmoles%20of%20solute%7D%7D%7B%5Ctext%7BVolume%20of%20solution%20in%20liters%7D%7D)
Now put all the given values in this formula, we get the moles of solute of the solution.
![0.85mole/L=\frac{\text{moles of solute}}{0.25L}](https://tex.z-dn.net/?f=0.85mole%2FL%3D%5Cfrac%7B%5Ctext%7Bmoles%20of%20solute%7D%7D%7B0.25L%7D)
![\text{moles of solute}=0.2125=0.21moles](https://tex.z-dn.net/?f=%5Ctext%7Bmoles%20of%20solute%7D%3D0.2125%3D0.21moles)
Therefore, the moles of solute is, 0.21 moles
Lead is a pure substance
paint is a mixture substance