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Avogadro's Law & Gay Lussac's Law

Combustion of...

Question

Combustion of glucose takes place according to the equation:
$C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + 6 H_{2} O, △ H = - 72 k c a l$
The energy required for production of $1.6 g$ of glucose is [molecular mass of glucose is $180 g m$ ]

A

0.064 k c a l

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B

0.64 k c a l

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C

6.4 k c a l

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D

64 k c a l

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Solution

The correct option is A $0.64 k c a l$
Formation of glucose will be the given by reaction taking place in reverse direction.
$6 C O_{2} + 6 H_{2} O + 72 C a l \to C_{6} H_{12} O_{6} + 6 O_{2}$
For production of $180 g m$ of glucose, heat energy is $72 k c a l s$ .
number of moles of glucose to be produced
= $\frac{1.6}{180}$
So required heat for $1.6 g m$ of glucose
$= \frac{72}{180} \times 1.6 = 0.64 k c a l$
Hence, option B is correct

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Similar questions

Q. Combustion of glucose takes place according to the equation.

C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + 6 H_{2} O △ H = 0 = - 72 k - c a l

The energy required for combustion of

1.6 g

Q. Combustion of glucose is according to the following reaction

C_{6} H_{12} O_{6} (s) + 6 O_{2} (g) \to 6 C O_{2} (g) + 6 H_{2} O (l); Δ H = - 2900 k J

How much heat energy if evolved in the combustion of 1.8g of glucose?

Q. In photosynthesis, 6 molecules of carbon dioxide combine with an equal number of water molecules through a complex series of reactions to give a molecule of glucose having a molecular formula

C_{6} H_{12} O_{6}

. How many grams of water would be required to produce 18 g of glucose? Compute the volume of water so consumed assuming the density of water to be

1 g c m^{- 3}

.
Rreaction that takes place during photosynthesis is:

6 C O_{2} + 6 H_{2} O

⟶

C_{6} H_{12} O_{6} + 6 O_{2}

Q. The incremental oxidation of 1 molecule of glucose during cellular respiration produces 30 molecules of ATP according to the balanced equation:

C_{6} H_{12} O_{6} + 6 O_{2} + 30 A D P + 30 P_{i} \to 6 H_{2} O + 6 C O_{2} + 30 A T P

ATP is then hydrolyzed by cells for a variety of biochemical processes.
Changes in free energy between glucose oxidation and ATP hydrolysis were compared. The table below illustrates the data collected:

Reaction	Change in Free Energy ( $△ G$ )
Glucose Oxidation	-686 kcal/mol
ATP Hydrolysis	-13 kcal/mol

Which statement best explains the data?

Q. How much carbon dioxide will be formed in the reaction when 25 grams of glucose and 40 grams of oxygen are made to react?
Reaction:

C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + 6 H_{2} O

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