Question

Diphosphorus pentoxide(P2O5) reacts with water to form phosphoric acid, a major industrial acid. In the laboratory, the oxide is used as a drying agent. a.What is the mass of 4.65 x 10 22molecules of phosphorus pentoxide?

Answer 1

Answer: The mass of
`4.65* 10^(22)` molecules of phosphorus pentoxide is 20.5 g

Step-by-step explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number
`6.023* 10^(23)` of particles.

To calculate the moles, we use the equation:

`\text{Number of moles}=\frac{\text{Given molecules}}{\text {avogadro's number}}=(4.65* 10^(22))/(6.023* 10^(23))=0.0772moles`

1 mole of
`P_2O_5` weigh = 283.9 g

Thus 0.0772 moles of
`P_2O_5` weigh =
`(283.9)/(1)* 0.0722=20.5g`

Thus the mass of
`4.65* 10^(22)` molecules of phosphorus pentoxide is 20.5 g