Chapter 1 – Basic Concepts of Chemistry
Assignment 1
Q.1. Calculate the number of atoms in 0.5 mole atoms of carbon (12C).
Q.2. Calculate the number of atoms in 3.2 g of sulphur.
Q.3. Calculate the number of molecules in 180 g of glucose (C6H12O6).
Q.4. Calculate the number of atoms in 18.0 g of glucose (C6H12O6).
Q.5. Calculate the number of atoms in 0.20 mole molecules of oxygen.
Q.6. Calculate the mass of all atoms in 1 mole of calcium. Also calculate the mass of an atom of calcium. (at. mass of Ca = 40)
Q.7. Calculate the mass of one molecule of sulphur dioxide (SO2).
(at. mass of S = 32, O = 16)
Q.8. What volume is occupied at S.T.P. by 1.4 g of nitrogen?
(at. mass of N = 14).
Q.9. What volume is occupied at S.T.P. by 6.023 × 1021 molecules of oxygen?
Q.10. What volume is occupied at S.T.P. by 0.2 mole of ammonia?
Q.11. One atom of an element 'X' weighs 6.644 × 10–23 g. Calculate the number of gram atoms in 80 kg of it.
Q.12. Calculate the number of molecules and number of atoms present in 5.60 L of ozone (O3) at S.T.P.
Q.13. Is the molar volume of CO2 same or different from CO ?
Q.14. How many molecules and atoms of sulphur are present in 0.1 mole of S8 molecules ?
Q.15. Calculate the
number of moles of iodine in a sample containing
1.0 × 1022 molecules.
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