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Mole concept and Stoichiometry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMole concept and Stoichiometry1 Mark
MCQ
Four grams of caustic soda contains :
  • A
    $6.02 \times 10^{23}$ atoms of it
  • B
    4 g atom of sodium
  • ✓
    $6.02 \times 10^{22}$ molecules
  • D
    4 moles of NaOH
✓

Answer

Correct option: C.
$6.02 \times 10^{22}$ molecules
Option C is correct.
40 g of NaOH contains $6.023 \times 10^{23}$ molecules
So, 4 g of NaOH contains $=6.02 \times 10^{23} \times 4 / 40$
$=6.02 \times 10^{22}$ molecules

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