Chapter 1 – Basic Concepts of Chemistry
Assignment 2
Q.1. Calculate the mass of 1 molecule of naphthalene (C10H8).
Q.2. Calculate the mass of 1 u (atomic mass unit) in grams.
Q.3. Calculate the number of molecules and number of atoms present in 11.2 litres of oxygen at S.T.P.
Q.4. Calculate the number of atoms in 52 mol of Ar.
Q.5. Calculate the number of atoms in 52 u of He.
Q.6. Calculate the number of atoms in 52 g of He.
Q.7. Calculate the number of atoms of each type in 5.3 g of Na2CO3.
Q.8. Calculate the number of molecules present in 1 dm3 of hydrogen at S.T.P.
Q.9. The mass of 94.5 mL of a gas at S.T.P. is found to be 0.2231 g. Calculate its molecular mass.
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