Question

Mannitol has an empirical formula of C3H7O3. It was determined that 0.8390 mol of mannitol has a mass of 152.7g. Given this information, find the molecular formula of mannitol.

Answer 1

moles= mass/ molar mass

molar.mass= 152.7/0.8390

molar mass=182

molar mass (E)

=3(C)+7(H)+3(O)

=36+7+48

=91

molar mass= n× empirical mass

n= molar mass/ empirical mass

n=182/91=2

molecular formula

=2(C3H7O3)

=C6 H14 O6

I hope this helps ( ╹▽╹ )