Question

determine the balanced thermochemical equation for the oxidation of one mole of sucrose. is the reaction gaining or losing energy? (Show this with an equation)

Determine the energy generated by eating one serving of jelly bellies by calculating based on grams of sucrose per serving of jelly belly

Answer 1

The balanced formula for the oxidation of sucrose:
C₁₂H₂₂O₁₁ + 12 O₂ --> 12 CO₂ + 11 H₂O

This is a combustion reaction.

Combustion is essentially the mixing of a compound (usually a hydrocarbon or carbohydrate) with oxygen, producing carbon dioxide and water. Combustion reactions are endothermic. They release heat.

The heat content of the products is less than the heat content of the reactants (delta H is negative).

The molar mass of sucrose C₁₂H₂₂O₁₁ is:

12 (12.01 amu ) + 22 ( 1.01 amu ) + 11 ( 16.00 amu) = 342.34 g/mol.

n = m / M = 5.00 g / 342.34 g/mol
n = 0.0146 mol

(0.0145 mol) (5.65 x 10^3 kJ / 1mol) = 82.5 kJ is released.

b) One serving size of jelly bellies contains 25 g of carbohydrates, all of which are sugars.

One Jelly Belly jelly bean contains 4 calories, making a standard serving size of 25 pieces add up to 100 calories.

All Jelly Belly jelly beans vary in terms of the specific ingredients that give them their flavor, but all also share the same fundamental ingredients that make them a jelly bean: sugar i.e., mainly composed of sucrose, corn starch and glucose syrup.

Jelly beans contains 70% of sugar of which maximum is sucrose. It also contains other sugars such as fructose.