Calculate the number of moles of H 2 in a sample containing 3-011 - 103 H 2 molecules-A- 5 - 10-21B- 2 - 1020- 5 - 1021D- 2 - 10-20

The correct option is A 5×10^ 21Number of moles = Number of molecules/Avogadro number =3.011× 10^3molecules/6.022×10^23molecules/mol = 5×10^ 21 moles ...

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Standard IX

Chemistry

Molecular Weight

Calculate the...

Question

Calculate the number of moles of $H_{2}$ in a sample containing $3.011 \times 10^{3} H_{2}$ molecules.

5 \times 10^{21}

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5 \times 10^{- 21}

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2 \times 10^{20}

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2 \times 10^{- 20}

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Solution

The correct option is B $5 \times 10^{- 21}$
$N u m b e r o f m o l e s = \frac{N u m b e r o f m o l e c u l e s}{A v o g a d r o n u m b e r}$
$= \frac{3.011 \times 10^{3} m o l e c u l e s}{6.022 \times 10^{23} m o l e c u l e s / m o l}$
$= 5 \times 10^{- 21} m o l e s$

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Calculate the number of moles of H2 in a sample containing 3.011×103 H2 molecules.

The correct option is B 5×10−21Number of moles=Number of moleculesAvogadro number =3.011×103molecules6.022×1023molecules/mol =5×10−21 moles

Calculate the number of moles of $H_{2}$ in a sample containing $3.011 \times 10^{3} H_{2}$ molecules.

The correct option is B $5 \times 10^{- 21}$
$N u m b e r o f m o l e s = \frac{N u m b e r o f m o l e c u l e s}{A v o g a d r o n u m b e r}$
$= \frac{3.011 \times 10^{3} m o l e c u l e s}{6.022 \times 10^{23} m o l e c u l e s / m o l}$
$= 5 \times 10^{- 21} m o l e s$