MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryMole _ Equivalent ConceptAtomic and Molecular Masses

Which of the following contains atoms equal to those in 12 g Mg ? (At. wt. Mg = 24)

A.12 gm C

B.7 gm N₂✓ Correct

C.32 gm O₂

D.None of These

Explanation

Moles of Mg 12 1 24 2 1 mole of Mg weights 24g The number of atoms in 1 2moles of 1 2 A Mg N x 1 mole 23 6.023 10 A N x a) Moles of C 12 1 12 1 mole of C weights 12g The number of c-atoms in 1 mole 1 A N x b) Moles of 2 7 1 28 4 N 1 mole of 2 N weights 28g Number of molecules of 2 1 4 A N N x But one molecule of 2 N contains two N-atoms 4 1 4 N x molecules of 2 N will contain 4 1 2 4 N x x atoms i.e. 1 2 A N x atoms c) Moles of 2 32 1 32 O mole 1 mole of 2 O weights 32g Number of molecules of 2 1 A O N x But one molecule of 2 O contains

Back to Question Bank

Practice More Like This

Take chapter-wise tests, track your progress, and master Mole _ Equivalent Concept.

Start Free Practice →