Glycine is one of the amino acids that forms proteins. Protein that is not required in the body is broken down in the liver. Unwanted nitrogen is converted to urea and eliminated in the urine. The maximum mass of urea (relative molecular mass = 60) that could be eliminated as a result of the breakdown of 1.00 g of glycine (relative molecular mass = 75) is, in gram, A. 0.40 B. 0.80 C. 1.00 D. 1.60

SSCE VCE Chemistry Quantifying Atoms and Compounds: Glycine is one of the amino acid

Glycine is one of the amino acids that forms proteins - VCE - SSCE Chemistry - Question 19 - 2003 - Paper 1

Question 19

Glycine is one of the amino acids that forms proteins. Protein that is not required in the body is broken down in the liver. Unwanted nitrogen is converted to urea a... show full transcript

Worked Solution & Example Answer:Glycine is one of the amino acids that forms proteins - VCE - SSCE Chemistry - Question 19 - 2003 - Paper 1

Step 1

Calculate the moles of glycine

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Answer

To calculate the moles of glycine, use the formula:

$\text{Moles} = \frac{\text{Mass}}{\text{Molar Mass}}$

For glycine, the mass is 1.00 g and the molar mass is 75 g/mol:

$\text{Moles of glycine} = \frac{1.00 \text{ g}}{75 \text{ g/mol}} = 0.0133 \text{ moles}$

Step 2

Calculate the moles of urea produced

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Answer

When glycine is broken down, it theoretically produces urea. The balanced reaction shows that 1 mole of glycine produces 1 mole of urea. Thus, the moles of urea produced will also be 0.0133 moles.

Step 3

Calculate the mass of urea produced

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Answer

To find the mass of urea produced, we use the formula:

$\text{Mass} = \text{Moles} \times \text{Molar Mass}$

For urea, the molar mass is 60 g/mol:

$\text{Mass of urea} = 0.0133 \text{ moles} \times 60 \text{ g/mol} = 0.80 \text{ g}$

Step 4

Select the correct answer

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Answer

The maximum mass of urea that could be eliminated is 0.80 g, which corresponds to option B.

Glycine is one of the amino acids that forms proteins - VCE - SSCE Chemistry - Question 19 - 2003 - Paper 1

Worked Solution & Example Answer:Glycine is one of the amino acids that forms proteins - VCE - SSCE Chemistry - Question 19 - 2003 - Paper 1

Calculate the moles of glycine

Calculate the moles of urea produced

Calculate the mass of urea produced

Select the correct answer

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