Question

Calculate how many moles of glycine are in a 160.0-g sample of glycine. express your answer using four significant figures.

Answer 1

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n(C2H5NO2)=m(C2H5NO2)/M(C2H5NO2)
M(C2H5NO2)=75g/mol
n=160/75=2,13mol

Answer 2

TO calculate for the number of moles, all we have to do is to take the ratio of mass over molar mass.

Glycine has a molecular formula of C2H5NO2 with a molar mass of 75.07 g/mol.

Therefore:

number of moles = 160 g / (75.07 g / mol)

number of moles = 2.13 moles