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Atoms and Molecules — Science STD 10 — Question

Tamilnadu BoardEnglish MediumSTD 10ScienceAtoms and Molecules1 Mark
MCQ
How many molecules at present in one gram of hydrogen?
  • A
    $6.023 \times 10^{23}$
  • ✓
    $3.011 \times 10^{23}$
  • C
    $2.5 \times 10^{23}$
  • D
    $1.5 \times 10^{23}$
✓

Answer

Correct option: B.
$3.011 \times 10^{23}$
(b) $3.011 \times 10^{23}$
Hint: $\mathrm{H}_2=$ Molar mass $=2 \mathrm{~g}$
$2 \mathrm{~g}$ of $\mathrm{H}_2$ contains $6.023 \times 10^{23}$ molecules
$\therefore 1 \mathrm{~g}$ of $\mathrm{H}_2$ will contain $=\frac{6.023 \times 10^{23}}{2} \times 1$
$=3.011 \times 10^{23}$ molecules.

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