Hope this help you!!! :))
The given pictures show conversion of energy from one form to another.
<h3>#Picture 1 </h3>
Electric energy to Heat energy
<h3>#Picture 2</h3>
Wind energy to electric energy
<h3>#Picture 3</h3>
Solar energy to light energy
<h3>#Picture 4 </h3>
Electric energy to light energy
The unit M means that mole/L, So first change the unit of solution volume to L which is 0.25 L. So the mole of solute is 2.5*0.25=0.625 mol.