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

Answer:

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

                                                     B.    C₁₂H₂₂O₁₁ + 12 O₂  ⇒  12 CO₂ +  11H₂O  

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