Answer:
![n_(solute)=0.406mol(NH_4)_2SO_4](https://img.qammunity.org/2021/formulas/chemistry/college/ttb1ogaf2147abu3vbg09b7qt8n4ajkt3c.png)
Step-by-step explanation:
Hello,
In this case, since the molarity is defined as the ratio of the moles of the solute to the volume of the solution in liters:
![M=(n_(solute))/(V_(solution))](https://img.qammunity.org/2021/formulas/chemistry/college/jzig7f0h43ie7ocnzfrap39t7zfjxkoh8n.png)
For the given volume and molarity, we solve for the moles of ammonium sulfate (solute) as shown below:
![n_(solute)=M*V_(solution)=1.25(mol)/(L)*325mL*(1L)/(1000mL) \\\\n_(solute)=0.406mol(NH_4)_2SO_4](https://img.qammunity.org/2021/formulas/chemistry/college/lg08vmrz5s5nvwhxr8h7saipk1y2fwbo14.png)
Best regards.