Question

Hummingbirds eat approximately 9.0g of sugar water per day

A. If the sugar water is 25% sucrose (C12H22O11) how many moles of sugar does a humming bird consume in a day ?
B. Remember that during respiration, a carbohydrate such as sucrose reacts with the oxygen molecule to produce carbon dioxide and water. Write a balanced equation for this process?

Answer 1

The answer to your question is A. 0.0066 moles or 6.6 x 10⁻³ moles

B. C₁₂H₂₂O₁₁ + 12 O₂ ⇒ 12 CO₂ + 11H₂O

Step-by-step explanation:

A.

Data

mass of sugar water = 9 g

concentration = 25%

moles of sugar (C₁₂H₂₂O₁₁)

Formula

Mass percent = mass of solute/mass of solution x 100

-Solve for mass of solute

Mass of solute = (mass percent x mass of solution) / 100

-Substitution

Mass of solute = (25 x 9)/100

-Result

Mass of solute = 225/100

= 2.25 g of sugar

-Calculate the molar mass of sugar

C₁₂H₂₂O₁₁ = (12 x 12) + (22 x 1) + (11 x 16)

= 144 + 22 + 176

= 342 g

-Calculate the moles of sugar

342 g ---------------------- 1 mol

2.25 g ------------------- x

x = (2.25 x 1) / 342

x = 2.25/342

x = 0.0066 moles or 6.6 x 10⁻³ moles

B. Balanced chemical reaction

C₁₂H₂₂O₁₁ + 12 O₂ ⇒ 12 CO₂ + 11H₂O