Write the chemical formula and the molar mass

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Reference no: EM131452572

Question 1

a) Write the chemical formula and the molar mass (g/mol) for the amino acid selenocysteine.

b) Complete the table by writing the relative masses (g) and %'s of the elements found in 1 mole of selenocysteine.

Element

Mass (in g) of element in 1 mole of selenocysteine

% of element in 1 mole of selenocysteine

C

 

 

H

 

 

N

 

 

O

 

 

Se

 

 

c) Stachyose is a tetrasaccharide found in vegetables and many plants. You are provided with a 0.8 M solution of stachyose.
Molar mass: stachyose (C24H42O21) = 666.58 g/mol.

What volume (in mL) will contain 350 μmoles of stachyose?

Question 2

a) Calculate the concentration of hydrogen ions [H+] for

- Lemon juice, pH 2.1
- Icelandic Glacial brand water, pH 8.4
- Milk, pH 6.5

b) Calculate the pH of

- 85 mM NaOH
- Milk of Magnesia, [H+] = 3.20 x 10-11 M
- 2.2 M Hydrobromic acid (HBr)

c) Calculate the pH obtained by dissolving 3.68 g of anhydrous
potassium ethanoate (MW = 98.14 g/mol) in 100 mL of 0.25 M ethanoic acid, given that the pKa of ethanoic acid = 4.75.

Question 3

You need to prepare 100 mL of a 0.5 M solution of LiCl.
You have 50 mL of a 0.65 M LiCl solution and 20 mL of a 5% (w/v) LiCl solution.

- Molar mass of LiCl = 42.39 g/mol
- % (weight / volume) means mass (in g) in volume (100 mL)

What volume of 5% LiCl and water needs to be added to the 50 mL of 0.65 M LiCl solution to make up 100 mL of 0.5 M LiCl?

Show your working for solving this question and complete the table below.

Question 4

Midori Melon Liqueur contains 20 % (v/v) ethanol, Wolf Blass Platinum Label Shiraz contains 14 % (v/v) ethanol and Old Speckled Hen Ale contains 5 % (v/v) ethanol.

- Absolute (100% vol/vol) ethanol: density = 0.79 g/mL
o %'s are vol/vol → i.e., volume of EtOH in 100 mL total volume
- Molecular weight of ethanol = 46.1 g/mol

a) Calculate the molarity of absolute ethanol (100% vol/vol).

b) Calculate the concentration of ethanol in the 3 separate beverages.
- Give the concentrations in g/L
- Give the concentrations as molarities

c) Determine the mass (g) of ethanol in each of the following 3 beverages.

- 500 mL bottle of Midori Melon Liqueur
- 750 mL bottle of Wolf Blass Platinum Label Shiraz
- 6 pack (6 x 355 mL bottles) of Old Speckled Hen Ale

Which beverage contains the highest amount (in g) of ethanol?

Reference no: EM131452572

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