Basic Calculation
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MUNISH KAKAR’s INSTITUTE OF CHEMISTRY S.C.O. No. 203, SECOND FLOOR, SECTOR 14, PANCHKULA. Phone : 9417655033, 9888019721 Mole Concept (Problem Sheet # 3) Q1. (a) Calculate the mass of 2.5 gram atoms of oxygen. (b) Calculate the gram atoms in 2.3 g of sodium. (c) Calculate the mass of 1.5 gram molecule of sulphuric acid. Q2. Calculate the mass of: (i) 1.2 gram atom of oxygen. (ii) 5.2 gram atom of iodine. (iii) 5.6 gram atom of chlorine Q3. What is the mass of 3.01 × 10 22 molecules of ammonia? Q4. Calculate the number of moles in 25 g of calcium carbonate and number of oxygen atoms. Q5. How many years would it take to spend one Avogadro’s number of rupees at a rate of 10 lakh of rupees in one second? Q6. How many atoms and molecule of sulphur are present in 64 g of sulphur S8? Q7. Calculate the number of water molecules in a drop of volume 0.05 mL. Q8. Which of the following will weigh the most? (i) 3.01 × 10 23 carbon atoms (ii) 20 g copper (iii) 0.1 gram atom of silver (iv) 5 gram atom of nitrogen Q9. What volume of CCl4 having density 1.5 g/cc will contain 10 25 atoms of chlorine? Q10. Calculate the mass of sodium which contain same number of atoms as are present in 4 g of calcium. Atomic masses of calcium and sodium are 40 and 23 respectively. Q11. How many atoms and molecules of phosphorus are present in 124 g P4? Q12. Calculate the volume occupied by 16 g O2 at NTP. Q13. Average molar mass of a mixture of CH4 and C2H4 present in thr ratio x : y is 20 g mol -1 . If ratio was reversed, the average molar mass will be…….? Q14. How many electrons are present in 2 × 10 -3 mol of 18 8 O 2 ? Q15. Calculate the number of atoms present in: (i) 52 moles of He (ii) 52 amu He (iii) 52 g He (Atomic mass of Helium is 4 amu)
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