Question

an organic compound contains 0.031% of phosphorus by mass if a molecule of the compound contains a single atom of phosphorus calculate the molar mass of the compound (givenP=31) what can you say about the volumn of a molecule of the compound




short notes​

Answer 1

Given info : an organic compound contains 0.031% of phosphorus by mass if a molecule of the compound contains a single atom of phosphorus.

To find : the molar mass of the compound is ..

solution : an organic compound contains 0.031 % of phosphorus by mass.

it means, 0.031 g of phosphorus in 100g of compound.

also a single atom of phosphorus is present in a molecule of phosphorus.

so, no of moles of phosphorus = no of moles of compound

⇒0.031g/(31 g/mol) = no of moles of compound

⇒no of moles of compound = 0.001 mol

now molar mass of compound = mass/no of moles

= 100g/(0.001 mol)

= 10⁵ g/mol

Therefore the molar mass of compound is 100000g or 100kg/mol.