0.400 g of chloroplatinate salt of a monoacid base on ignition gave 0.125 g of platinum. Find the molecular mass of the base.

Explanation

To find the molecular mass of the monoacid base from the given chloroplatinate salt, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Data:**
- Mass of chloroplatinate salt (m_salt) = 0.400 g
- Mass of platinum residue (m_Pt) = 0.125 g

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