Question

What mass of dinitrogen monoxide, N2O, contains the same number of molecules as 3.00 g of trichlorofluoromethane, CCl3F

Answer 1

For number of molecules to be same, the number of moles of both molecule will be same

Molar mass of CCl3F = 1*MM(C) + 3*MM(Cl) + 1*MM(F)

= 1*12.01 + 3*35.45 + 1*19.0

= 137.36 g/mol

mass of CCl3F = 3.00 g

we have below equation to be used:

number of mol of CCl3F,

n = mass of CCl3F/molar mass of CCl3F

=(3.0 g)/(137.36 g/mol)

= 2.184*10^-2 mol

So,

moles of N2O should also be same

Molar mass of N2O = 2*MM(N) + 1*MM(O)

= 2*14.01 + 1*16.0

= 44.02 g/mol

we have below equation to be used:

mass of N2O,

m = number of mol * molar mass

= 2.184*10^-2 mol * 44.02 g/mol

= 0.961 g

Answer: 0.961 g