Question

How many molecules in 48 grams of P2O5?

Answer 1

`1.99*10^(23)molecules`

Explanations

Given the following parameters

Mass of P2O5 = 48 grams

Convert mass to moles

`\begin{gathered} moles\text{ of P}_2O_5=\frac{mass}{molar\text{ mass}} \\ moles\text{ of P}_2O_5=(48)/(144.94) \\ moles\text{ of P}_2O_5=0.3312moles \end{gathered}`

Convert moles to molecules uusing the Avogadros constant. According to the Avogadro's constant;

`\begin{gathered} 1mole=6.02*10^(23)molecules \\ 0.3312moles\text{ of P}_2O_5=0.3312*6.02*10^(23) \\ 0.3312moles\text{ of P}_2O_5=1.99*10^(23)molecules \end{gathered}`

Hence the number of molecules in 48 grams of P2O5 is 1.99 * 10^23 molecules