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Q63
(CGS/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
A tablespoon holds 0.5 mole of water. What is the number of molecules present in it?
Result
Your answer:
—
·
Correct:
B
Explanation
The number of molecules in a substance is determined by the mole concept. According to Avogadro's law, one mole of any substance contains approximately 6.022 × 1023 particles (atoms, molecules, or ions). This constant is known as Avogadro's number (NA).
To find the number of molecules in 0.5 mole of water (H2O), we use the formula:
Number of molecules = moles × NA
Substituting the given values:
0.5 × 6.022 × 1023 = 3.011 × 1023
Therefore, 0.5 mole of water contains 3.01 × 1023 molecules. Option A represents the number of molecules in one full mole, while options C and D are incorrect numerical values unrelated to the Avogadro constant.
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