Question:medium

How many molecules of carbon dioxide are formed when 0.6 g carbon is burnt in air?

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To calculate the number of molecules produced in a chemical reaction, first determine the moles and then multiply by Avogadro's number.
Updated On: Nov 26, 2025
  • 3.01 $\times$ 10$^{22}$
  • 2.01 $\times$ 10$^{23}$
  • 6.02 $\times$ 10$^{23}$
  • 5.06 $\times$ 10$^{23}$
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The Correct Option is C

Solution and Explanation


The molar mass of carbon (C) is 12 g/mol. The moles of carbon are calculated as follows: \[ \text{moles of C} = \frac{0.6 \, \text{g}}{12 \, \text{g/mol}} = 0.05 \, \text{mol} \] The balanced equation for carbon combustion is: \[ C + O_2 \rightarrow CO_2 \] This indicates a 1:1 molar ratio between carbon and carbon dioxide. Thus, 0.05 moles of carbon yield 0.05 moles of CO2. The number of CO2 molecules is determined by multiplying by Avogadro's number: \[ \text{molecules of CO}_2 = 0.05 \, \text{mol} \times 6.02 \times 10^{23} \, \text{molecules/mol} = 3.01 \times 10^{22} \, \text{molecules} \]
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