Question

An organic compound contains 0.031% of phosphorus by mass if the molecule of the compound contains a single atom of phosphorus calculate the molar mass of the compound . what can you say about the volume of molecule of the compound​

Answer 1

Answer:

A compound contains 10 2 of phosphorous If atomic mass of phosphorus is 31 the molecular mass of the compound having one phosphorus atom per molecule is

This means that If the atomic mass of P is 31, then the molecular mass of the compound having one phosphorus atom per molecule is 3.1×105. Thus, the correct option is A. 3.1×105 .

Answer 2

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

To find :

• the molar mass of the compound is..
• the volume of the compound is ..

solution : An organic compound contains 0.031% of phosphorus by mass. it means, if the mass of the organic compound is 100,000 g , then mass of phosphorus can be obtained from it is 31g.

we know,

  atomic mass of a phosphorus atom = 31 g/mol

so the compound contains no of moles of phosphorus atom = mass of phosphorus in the compound/atomic mass of phosphorus

= $\frac{31g}{31g/mol}$ = 1 mol

it has given that, the molecule of the compound contains a single atom of phosphorus.

so the no of moles of organic compound = no of moles of phosphorus atom = 1 mol

now the molecular mass of the organic compound = mass of organic compound/no of moles of organic compound

= 100,000 g/1 mol

=  10⁵ g/mol

therefore the molar mass of the compound is 10⁵ g/mol.

at standard temperature and pressure,

volume of one mole of an ideal gas is 22.4 L. so if we consider it in STP, the volume of gas would be 22400 ml.