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Isobars and Isotopes

One mole of a...

Question

One mole of any substance contains $6.022 \times 10^{23}$ atoms/molecules. Number of molecules of $H_{2} S O_{4}$ present in 100 mL of 0.02M $H_{2} S O_{4}$ solution is ___.

12.044 \times 10^{20}

molecules

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1 \times 10^{23}

molecules

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12.044 \times 10^{23}

molecules

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6.022 \times 10^{23}

molecules

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Solution

The correct option is A $12.044 \times 10^{20}$ molecules
Calculating the number of moles of $H_{2} S O_{4}$

Given:

1 mole of substance contains $6.022 \times 10^{23}$ molecules.

Volume of solution = 100 mL = 0.1 L
Molarity of solution = 0.02 M

We Know,

$M o l a r i t y = \frac{number of moles of solute}{Volume of solution (in L)}$

$∴$ no. of moles of solute = molarity $\times$ volume
$= 0.02 m o l L^{- 1} \times 0.1 L$
= 0.002 mol

Calculating the number of molecules of $H_{2} S O_{4}$

Number of molecules of $H_{2} S O_{4}$
= number of moles $\times 6.022 \times 10^{23}$
= $0.002 \times 6.022 \times 10^{23}$
= $12.044 \times 10^{20}$ molecules

Thus, $12.044 \times 10^{20}$ molecules of $H_{2} S O_{4}$ are present in 100 mL of 0.02 M $H_{2} S O_{4}$ solution.

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Similar questions

One mole of any substance contains $6.022 \times 10^{23}$ atoms/molecules. Number of molecules of $H_{2} S O_{4}$ present in 100 mL of $0.02 M H_{2} S O_{4}$ solution is.............

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Isobars and Isotopes

Standard XII Chemistry

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One mole of any substance contains 6.022×1023 atoms/molecules. Number of molecules of H2SO4 present in 100 mL of 0.02M H2SO4 solution is ___.

One mole of any substance contains $6.022 \times 10^{23}$ atoms/molecules. Number of molecules of $H_{2} S O_{4}$ present in 100 mL of 0.02M $H_{2} S O_{4}$ solution is ___.