Final answer:
Five moles of diphosphorus pentoxide (P2O5) weigh 709.70 grams. The molar mass is calculated first and then multiplied by the number of moles.
Step-by-step explanation:
The student asked how many grams are in 5 moles of diphosphorus pentoxide (P2O5). To answer this question, one must calculate the molar mass of P2O5 and then multiply by the number of moles given.
To find the molar mass, we look at the periodic table:
- Phosphorus (P) has a molar mass of approximately 30.97 g/mol.
- Oxygen (O) has a molar mass of approximately 16.00 g/mol.
Since the formula P2O5 has 2 atoms of phosphorus and 5 atoms of oxygen, its molar mass will be:
(2 × 30.97 g/mol) + (5 × 16.00 g/mol) = 61.94 g/mol + 80.00 g/mol = 141.94 g/mol
Now, to find the mass of 5 moles:
5 moles × 141.94 g/mol = 709.70 grams