The Avogadro's constant is the number of?

Molecules in 1 mole of a substance

Electrons in 1 gram of hydrogen

Protons in 1 mole of a substance

Which of the following statements is incorrect?

12 g of carbon gas contains one mole of atoms

28 g of nitrogen gas contains one mole of molecules of N2

1dm3 of 1.0 mole dm-3 solution of NaCl contains one mole of chloride ions

One mole of propane has the same

Number of H- atoms as one mole of methane (CH4)

Number of C-atoms as in one mole of butane (C4H10)

Mass as half a mole of hexane (C6H14)

Number of molecules as in one mole of ethane (C2H6)

MCQs On Stoichiometry and Stoichiometric Calculations Live Quiz

Chemistry

Grade 9th,
Grade 10th,
Grade 11th,
Grade 12th

Reviewed by Janyce Wowk

Janyce Wowk, BS (Chemistry) |

Chemistry

Review Board Member

Janyce Wowk is a chemistry professional with a B.S. in Chemistry from Montclair State University. Her experience as a research assistant and lab technician in a PFAS laboratory has allowed her to develop strong laboratory, data analysis, and research skills.

, BS (Chemistry)

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| Attempts: 7,845 | Questions: 18 | Updated: Aug 19, 2025