30. · calculate the number of moles of ammonium sulphate present in 15.84 kg of it. (h=1, n=14,...
TRANSCRIPT
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: 4 3 2 4 312 3 4 ( )Al C H O CH Al OH . Calculate the volume of CH4 releasedfrom 14.4 g of Al4C3 by excess water at S.T.P. (C = 12, Al = 27)
LLT Edu
catio
n Serv
ices
Compiled by Rahul Arora
+91-997-164-9026
Page 2| LLT Education Services | www lltes.com [email protected]
LLT Education Services, Kendriya Vihar Sector 51, Noida
+91-997-164-9026
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 accordingto the equation: 4 2 7 2 2 3 2( ) 4NH Cr O N Cr O H O . (i) What volume of nitrogen atS.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 anenclosed vessel. Calculate the total volume of gases after the burning is completed. Allvolumes 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)
LLT Edu
catio
n Serv
ices
Compiled by Rahul Arora
+91-997-164-9026
Page 3| LLT Education Services | www lltes.com [email protected]
LLT Education Services, Kendriya Vihar Sector 51, Noida
+91-997-164-9026