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Question

# Glucose, also known as "blood sugar" when measured in blood, has the formula $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$. (a) Write the equation for the combustion of glucose with $\mathrm{O}_2$ to give $\mathrm{CO}_2$ and $\mathrm{H}_2 \mathrm{O}$. (b) If 3.8 kcal is released by combustion of each gram of glucose, how many kilojoules are released by the combustion of 1.50 mol of glucose? (c) What is the minimum amount of energy a plant must absorb to produce 15.0 g of glucose?

Solution

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Given the formula of glucose, which is C$_6$H$_{12}$O$_6$, we are required to

(a) Write the equation for the combustion of glucose with O$_2$ to give CO$_2$ and H$_2$O.

(b) If 3.8 kcal (16 kJ) is released by the combustion of each gram of glucose, how many kilocalories are released by the combustion of 1.50 mol of glucose? How many kilojoules?

(c) What is the minimum amount of energy (in kJ) a plant must absorb to produce 15.0 g of glucose?

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