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Study Material for Class 9 Science Chapter 3 Atoms and Molecules
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Class 9 Science Chapter 3 Atoms and Molecules
CBSE Class 9 Science Atoms and Molecules Sure Shot Questions B. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.
1. Calculate the number of moles in i) 4.6g sodium ii) 5.1g of Ammonia iii) 90g of water iv) 2g of NaOH
2. Calculate the number of molecules in 360g of glucose.
3. Find the mass of 2.5 mole of oxygen atoms
4. Calculate the mass of 12.046 x 1023 molecules in CaO.
5. Calculate the number of moles in 24.092 x 1022 molecules of water.
6. Calculate the number of moles in a) 12.046 x 1023 atoms of copper b) 27.95g of iron c) 1.51 x 1023 molecules of CO2
7. If 3.0115 x 1023 particles are present in CO2. Find the number of moles.
8. Find the number of moles present in 24.088 x 1023 particles of carbon dioxide
9. Calculate the number of atoms in 48g of Mg
10. Calculate the number of molecules in 3.6 g of water
11. Calculate the number of atoms in 0.5 moles of carbon
12. Calculate the number of moles in 12g of oxygen gas
13. Calculate the number of moles present in 14g of carbon monoxide .
14. Find the mass of 5 moles of aluminium atoms?
15. Calculate the molar mass of sulphur.
16. Calculate the mass of 0.2 mole of water molecules.
17. Which has greater number of atoms, 100g of sodium or 100g of iron?
18. How many atoms of oxygen are present in 300 grams of CaCO3?
19. The mass of one atom of an element 'A' is 2.65 x 10-23 g. Calculate its atomic mass and name the element.
20. Calculate the number moles of magnesium in 0.478g of magnesium ?
21. In which of the following cases the number of hydrogen atoms is more ? Two moles of HCl or one mole of NH3.
22. Calculation of number of hydrogen atoms present in 1 mole of NH3
23. Find the number of oxygen atoms in 88g of CO2?
24. Calculate the number of water molecules contained in a drop of water weighing 0.06g ?
25. Find the number of aluminium ions present in 0.051g of aluminium oxide(Al2O3). (Atomic masses: Al= 27u;O= 16u)
26. Calculate the mass of 1.000 mole of CaCl2
27. Calculate grams in 3.0000 moles of CO2
28. Calculate number of moles in 32.0 g of CH4
29. Determine mass in grams of 40.0 moles of Na2CO3
30. Calculate moles in 168.0 g of HgS
31. Calculate moles in 510.0 g of Al2S3
32. How many moles are in 27.00 g of H2O
33. Determine the mass in grams of Avogadro number of C12H22O11
34. Find mass in grams of 9.03 moles of H2S
35. Determine grams in 1.204 mole of NH3
Consider the molecule CuNH4Cl3 as you answer 11 - 19.
36. Name the elements present.
37. How many atoms form the molecule?
38. How many of each atom in the molecule?
39. How many hydrogen atoms in one mole of molecules?
40. How many chlorine atoms in six moles of molecules?
41. What is the molar mass of this molecule?
42. Name this molecule.
43. What is the mass in grams of one molecule?
44. How many moles would be in 6.84 g of this substance?
45. You need 0.0100 mole of lead (II) chromate. How much should you weigh on the scale?
46. Given 6.40 g of HBr. How many moles is this?
47. Write the correct formula for calcium acetate and then answer 23 - 25 based on it.
48. What is the mass of exactly one mole of calcium acetate?
49. How many moles are contained in 1.58 g of the substance in #23?
50. How much does 0.400 mole of #23 weigh?
51. Write the formula for oxygen gas.
52. How many atoms (and moles) are represented by the formula in #26?
53. What is the mass of Avogadro Number of oxygen molecules?
54. Calculate the molar mass of HNO3. [N = 14, O = 16, H = 1]
55. Calculate the formula mass of CaCl2. [Ca = 40, Cl = 35.5]
56. A certain non-metal X forms two oxides I and II. The mass percentage of oxygen in oxide I (X4O6) is 43.7, which is same as that of X in oxide II. Find the formula of the second oxide.
57. Calculate the mass of 0.2 moles of water (O=16, H=1).
58. What is the volume of 7.1 g of chlorine (Cl=35.5) at S.T.P.
59. The reaction between aluminium carbide and water takes place according to the following equation: Al4C3 + 12H2O → 3CH4 + 4Al(OH)3 . Calculate the volume of CH4 released from 14.4 g of Al4C3 by excess water at S.T.P. (C = 12, Al = 27)
60. A compound of sodium, sulphur and oxygen has the following percentage composition.
Na=29.11%, S=40.51%, O=30.38%. Find its empirical formula (O=16, Na=23, S=32).
61. Solid ammonium dichromate with relative molecular mass of 252 g decomposes according to the equation: (NH4 )Cr2O7 → N2 + Cr2O3 + 4H2O. (i) What volume of nitrogen at S.T.P will be evolved when 63 g of (NH4)2Cr2O7 is decomposed? (ii) If 63 g of
(NH4)2Cr2O7 is heated above 1000C, what will be the loss of mass? (H=1, N=14, O=16, Cr=52).
62. How many litres of ammonia are present in 3.4 kg of it? (N = 14, H = 1)
63. About 640 mL of carbon monoxide is mixed with 800 mL of oxygen and ignited in an enclosed vessel. Calculate the total volume of gases after the burning is completed. All volumes are measured at S.T.P.
64. Calculate the number of moles of ammonium sulphate present in 15.84 kg of it. (H=1, N=14, O=16, S=32)
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