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(D) To find the number of molecules,we calculate the number of moles for each option:$A$: $22.4 	imes 10^3 \ mL = 22.4 \ L$. At $STP$,$1 \ mole$ of g

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$0.1 \ mole$ of $CO_2$ gas

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(D) To find the number of molecules,we calculate the number of moles for each option:$A$: $22.4 	imes 10^3 \ mL = 22.4 \ L$. At $STP$,$1 \ mole$ of gas occupies $22.4 \ L$. So,$22.4 \ L = 1 \ mole$.$B$: Molar mass of $CO_2 = 12 + (2 	imes 16) = 44 \ g/mol$. Moles = $22 \ g / 44 \ g/mol = 0.5 \ mole$.$C$: At $STP$,$11.2 \ L / 22.4 \ L/mol = 0.5 \ mole$.$D$: Given as $0.1 \ mole$.Comparing the values: $1 \ mole > 0.5 \ mole > 0.1 \ mole$. Therefore,$0.1 \ mole$ of $CO_2$ gas has the smallest number of molecules.

Which of the following has the smallest number of molecules?

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