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.

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

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c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.