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Chemistry
28 March, 17:30
How many total atoms are in 0.830 g of p2o5?
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Renee Hensley
28 March, 17:52
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First calculate moles of P2O5. moles = grams / molar mass
The molar mass for P2O5 = 2 x P (2 x 31.0) + 5 x O (5 x 16.0) = 142 g/mole.
0.760 g P2O5 x (1 mole P2O5 / 142 g P2O5) = 0.00535 moles P2O5
0.00535 moles P2O5 x (6.02 x 10^23 molecules P2O5 / 1 mole P2O5) = 3.22 x 10^21 molecules P2O5
Each molecule of P2O5 contains 2 P atoms and 5 O atoms (total = 7 atoms).
3.22 x 10^21 molecules P2O5 x (7 atoms / 1 molecule P2O5) = 2.25 x 10^22 atoms
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