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Chapter 7: Problem 48

What is the molar mass of the amino acid glycine, \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NO}_{2} ?\)

Short Answer

Expert verified
The molar mass of glycine (C2H5NO2) is 75.07 g/mol.

Step by step solution

01

Determine the molar masses of each element within glycine

Using the periodic table or other reference, find the molar masses of carbon (C), hydrogen (H), nitrogen (N), and oxygen (O). They are approximately 12.01 g/mol, 1.008 g/mol, 14.01 g/mol, and 16.00 g/mol, respectively.
02

Calculate the molar mass of the carbon atoms

There are 2 carbon atoms in glycine. Therefore, total mass of carbon is \(2 × 12.01g/mol = 24.02g/mol)\.
03

Calculate the molar mass of the hydrogen atoms

Glycine contains 5 hydrogen atoms. Therefore, total mass of hydrogen is \(5 × 1.008g/mol = 5.04g/mol)\.
04

Calculate the molar mass of the nitrogen atom

There is 1 nitrogen atom in glycine. Therefore, the mass of nitrogen is \(1 × 14.01g/mol = 14.01g/mol)\.
05

Calculate the molar mass of the oxygen atoms

Finally, there are 2 oxygen atoms in glycine. So, total mass of oxygen is \(2 × 16.00 g/mol = 32.00 g/mol)\.
06

Add up the molar masses

To find the molar mass of the entire molecule, add together the molar masses you calculated for the carbon, hydrogen, nitrogen, and oxygen atoms. So, molar mass of glycine = (24.02g/mol + 5.04g/mol + 14.01g/mol + 32.00g/mol = 75.07 g/mol)

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Use the following terms to create a concept map: atoms, average atomic mass, molecules, mole, percentage composition, and molar masses.
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