How many moles of magnesium phosphate, `Mg_(3)(PO_(4))_(2)`, will contains 0.25 mole ofoxygen atoms?

Options

A. 0.02
B. `3.125xx10^(-2)`
C. `1.25xx10^(-2)`
D. `2.5xx10^(-2)`

Answer

B

Explanation

`because` 8 mole oxygen atoms are present in 1 mole `Mg_(3)(PO_(4))_(2)`
`therefore` 0.25 mole oxygen atoms will be present in `(1)/(8)xx0.25` mole
`Mg_(3)(PO_(4))_(2)`, i.e.,`3.125xx10^(-2)` mole `Mg_(3)(PO_(4))_(2)`.