Question

Calculate the number of phosphorus atoms in a 140 g sample of diphosphorus pentoxide . Be sure your answer has a unit symbol if necessary, and round it to significant digits.

Answer 1

Answer:

2.95 * 10^23  of phosphorus atoms

Explanation:

molar mass of diphosphorus pentoxide = 283.886 g/mol

Number of moles in 140 g = 140 g/283.886 g/mol = 0.49 moles

1 mole of P2O5 contains 6.02 * 10^23 phosphorus atoms

0.49 moles of P2O5 contains 0.49 *  6.02 * 10^23/1 = 2.95 * 10^23  of phosphorus atoms