What is the mole fraction of urea, CO(NH2)2, in a solution prepared by dissolving 4.0 g of urea in 32.0 g of methanol, CH3OH

0.0630

Explanation:

The molar mass of urea = 60 g/mol

we all know that:

Then; the number of moles of urea

=

= 0.0667 mol

Similarly; the number of moles of methanol

=

= 0.9988 mol

The total number of moles = (0.0667 + 0.9988) mol

= 1.0655 mol

Finally,the mole fraction of urea   =

=

= 0.0630

- lead + phosphoric acid = hydrogen + lead(ii) phosphate