Question

What is the mass percentage of oxygen in Ba3(PO4)2? Please help how do I go about figuring this out?

Answer 1

Molecular Mass of Compound.

`\\ \sf\longmapsto Ba_3(PO_4)_2`

`\\ \sf\longmapsto 3(137u)+2(39u+4(16u))`

`\\ \sf\longmapsto 411u+2(39u+64u)`

`\\ \sf\longmapsto 411u+2(103u)`

`\\ \sf\longmapsto 411u+206u`

`\\ \sf\longmapsto 617u`

• Molecular mass of O in compound=16(4)=64u

`\\ \sf\longmapsto Mass\%\:of\:O`

`\\ \sf\longmapsto (64)/(617)* 100`

`\\ \sf\longmapsto (6400)/(617)`

`\\ \sf\longmapsto 10.3\%`