Question

Number of hydrogen molecules present in 3 moles of hydrogen is______.

• A. $18.069\times {10}^{22}$
• B. $18.069\times {10}^{23}$
• C. $18.069\times {10}^{20}$
• D. $18.069\times {10}^{21}$

Answer 1

The correct option is B $18.069\times {10}^{23}$

1 mole of hydrogen contains $6.023\times {10}^{23}$ molecules.
Therefore, 3 moles of hydrogen contains:
$3\times 6.023\times {10}^{23}$
$=18.069\times {10}^{23}$ molecules
Three moles of hydrogen contains $=18.069\times {10}^{23}$ molecules.