Question

How many moles of CF4 are there in 171 g of CF4?

Answer 1

Total moles of CF4 = 12.010 + 18.998 *4

As atomic mass of C = 12.010 g / mol

and atomic mass of F = 18.998 g /mol

moles in CF4 = 171 / [12.010 + 18.998 * 4]

= 171 / 88.002
= 1.943 mol.......................................ans

Answer 2

We know that No . of moles , n = mass / molar mass
Molar mass of CF4 = 12 + 4*19 = 88 g / mol
Given mass of CF4 = 171 g
Plug the values we get n = 171g / 88 g / mol
= 1.94 mol