Atoms and Molecules MCQ Chapter 3 Class 9 Science
Atoms and Molecules MCQ/Objective questions Chapter 3 Class 9 Science
Atoms and Molecules
7. What is the mass of 1 mole of nitrogen atoms
7. What is the mass of—(a) 1 mole of nitrogen atoms? (b) 4 moles of aluminium atoms (Atomic mass of aluminium= 27)? (c) 10 moles of sodium sulphite (Na2SO3)?
6. Calculate the molar mass of the following substances.
6. Calculation of atomic masses of molecules (a) Ethyne, C2H2(b) Sulphur molecule, S8(c) Phosphorus molecule, P4 (Atomic mass of phosphorus= 31)(d) Hydrochloric acid, HCl(e) Nitric acid, HNO3.
4. Write the chemical formulae of the following
4. Write the chemical formulae of the following. 5. Give the names of the elements present in the following compounds.