The chemical equation is
![2Ag+SO_4\to Ag_2SO_4](https://img.qammunity.org/2023/formulas/chemistry/college/z706b3tglngwdbg91kw7o0nnz636ai7p5z.png)
According to the equation, the ratio between Ag and the product is 2:1.
So, if we have 0.50 moles of Ag, then we use the ratio to find the moles of the product.
![0.50\text{mol(Ag)}\cdot\frac{1\text{mol(Ag}_2SO_4)}{2\text{moles(Ag)}}=0.25\text{mol(Ag}_2SO_4)](https://img.qammunity.org/2023/formulas/chemistry/college/i4bja1fduameivf6eonhufegxqjd7j1juf.png)
Therefore, there can be formed 0.25 moles of Ag2SO4 from 0.50 mol of Ag.