Zeee Y.

asked • 01/10/20

Hydrogencarbonate

Sherbet lemons are sweets which consist of a flavoured sugar shell filled with sherbet. The sherbet contains sodium hydrogencarbonate, NaHCO3 and tartaric acid (2,3- dihydroxybutanedioic acid)

Tartaric acid

a) Assuming all of the sugar is present as sucrose, C12H22O11, write an equation for the complete combustion of sucrose, which gives carbon dioxide and water.

b)

-1

b) The standard enthalpy change of combustion (ie the amount of heat) of sucrose is 5644 kJ mol-1. Calculate the energy released when one sweet containing 6.70 g of sucrose is completely burnt.

c) A man needs to consume about 2500 dietary calories per day. Given that 1 kJ = 0.239 dietary calories, how many sweets must a man consume in order to meet his daily calorific requirement?

Sherbet produces a slight fizzing sensation in the mouth when tartaric acid reacts with the sodium hydrogencarbonate to make carbon dioxide. The reaction is given below:

In a laboratory experiment, one sherbet lemon sweet produced 6.00 mL of carbon dioxide

d) e)

Calculate the minimum masses of tartaric acid necessary to produce this volume of carbon dioxide. Assume that 1 mole of carbon dioxide occupies 24.0 L at room temperature and pressure.

By making the appropriate substitutions for A, B, D and E in the structure shown below, how many different stereoisomers of tartaric acid are there?

Citric acid is used to flavour sherbet lemons. Its formula may be written as HOOCCH2.C(OH)(COOH).CH2COOH. How many chiral carbon atoms does this module contain?

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