0.40g of an organic compound containing phosphorus gave 0.555 g of `Mg_(2)P_(2)O_(7)` by usual analysis calculate the % of phosphorus in the organic compound

Explanation

To calculate the percentage of phosphorus in the organic compound, we can follow these steps:

### Step 1: Determine the mass of phosphorus in Mg2P2O7
1. **Given Data**:
- Mass of Mg2P2O7 = 0.555 g
- Molar mass of Mg2P2O7 = 222 g/mol (calculated as follows):
- Molar mass of Mg = 24 g/mol, so for 2 Mg: \( 2 \times 24 = 48 \) g
- Molar mass of P = 31 g/mol, so for 2 P: \( 2 \times 31 = 62 \) g
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