Same chapter1 markDifficulty: Medium
The number of moles in 36 g of water is: (H = 1, O = 16)
Mole Concept and Stoichiometry
3 marksDifficulty: Medium
Calculate the number of molecules in 8 g of oxygen gas. (O = 16, Avogadro number = 6.022 × 1023)
Original Khojo Papers practice question — not from a past board paper.
Answer
1.5055 × 1023 molecules
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
8 g of O2 is 8 ÷ 32 = 0.25 mole, and each mole contains 6.022 × 1023 molecules, so the number is 0.25 × 6.022 × 1023 = 1.5055 × 1023.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
Calculate the vapour density of carbon dioxide. (C = 12, O = 16)
Mole Concept and Stoichiometry
Same chapter3 marksDifficulty: Medium
Calculate the volume occupied by 0.5 mole of any gas at S.T.P.
Mole Concept and Stoichiometry
Same chapter3 marksDifficulty: Medium
State Gay-Lussac's law of combining volumes and Avogadro's law.
Mole Concept and Stoichiometry
Same chapter3 marksDifficulty: Medium
Calculate the mass of 2.24 dm3 of carbon dioxide at S.T.P. (C = 12, O = 16)
Mole Concept and Stoichiometry
Same chapter3 marksDifficulty: Medium
Calculate the number of atoms in 0.5 mole of sulphur dioxide molecules.
Mole Concept and Stoichiometry