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

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

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n (C2H5NO2) = m (C2H5NO2) / M (C2H5NO2)

M (C2H5NO2) = 75g/mol

n=160/75=2,13mol