Question

1
As a simplification, an adult human can be considered to have a daily diet of 1.80 kg of
carbohydrate (empirical formula CH2O).
Which mass of carbon dioxide does a person produce each day it all the carbohydrate eaten is
digested and oxidised?
A 0.267 kg
B 0.800 kg
C
1.32 kg
D 2.64 kg

Answer 1

Answer:

A) 0.267 kg

Explanation:

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Answer 2

Answer:

If 1.8 kg of carbohydrate (empirical formula CH₂O ) is oxidized completely, then it produces 2.64 kg of CO₂.

Explanation:

The combustion reaction of carbohydrate is given by  

                 CH₂O + O₂  →  CO₂ + H₂O

So, 1 mole of carbohydrate produces 1 mole of CO₂.

Given that,

                 mass of CH₂O = 1.80 kg

from the empirical formula,

   formula mass of CH₂O = 12 + 2×1 + 16 = 30 g/mol

              moles of CH₂O = mass of CH₂O ÷ formula mass of CH₂O

⇒                                      = 1.8 ×10³g / 30gmol⁻¹ = 60 mol

                      1 mol CH₂O   ≡  1 mol CO₂

⇒                60 mol CH₂O   ≡ 60 mol CO₂

then,

              mass of CO₂ = moles of CO₂ × molar mass of CO₂

⇒                                  = 60 × 44 = 2640 g =2.64 kg

The correct option is D