chemistry 1 help

Question

Glucose,  is used as an energy source by the human body. The overall reaction in the body is described by the equation

Calculate the number of grams of oxygen required to convert  of glucose to  and 

Answer 1

The balanced chemical reaction equation

C₆H₁₂O₆(aq) + 6O₂(g) ⟶ 6CO₂(g) + 6H₂O(l)

is an equation in moles. You have grams. To use the chemical reaction equation, you must convert the grams of C₆H₁₂O₆ into moles of C₆H₁₂O₆. To do so, you must use the molar mass. The molar mass is calculated by adding up all the pieces:

C: 6(12.011) = 72.066

H: 12(1.008) = 12.096

O: 6(15.999) = 95.994

==================

Total = 180.156 grams/mole

43 grams/180.156 grams/mole = 0.23868 moles

According to the chemical reaction equation, you need 6 times as many moles of O₂ as you do moles of C₆H₁₂O₆ so that means you need (6)(0.23868) moles of O₂ or 1.43209 moles of O₂.

Now, you need to convert the 1.43209 moles of O₂ into grams of O₂. You do that by using the molar mass. The molar mass of O₂ is 2(15.999) = 31.998 grams/mole so 1.43209 moles of O₂ times 31.998 grams/mole or O₂ = 45.8 grams of O₂