Answer to Question #299831 in General Chemistry for ฟ้า

Question

What is the mole fraction of the solvent that contains 10.0 grams of Phosphorus pentachloride that has been dissolved in 750 mL of water?

Answer 1

750ml = 750g

Molar mass of water= 18.01528g/mol

Molar mass of phosphorus pentachloride= 208.24g/mol

Mole fraction= mole of target substance divided by total moles involved

Mole of water=(750÷18.01528)

= 41.63

Mole of phosphorus pentachloride=(10÷208.24)= 0.048

Mole total=(41.63+0.048)=41.678

Mole fraction of solvent therefore is;

(41.63÷41.678)=0.9988

= 0.9988