Chemistry 1210 Quiz #5A Oct 1, 2002 Dr. B. Jackson

51. Code A

52. What is the formula weight of (NH₄)₂CO₃ ?

a) 78 b) 96 c) 86 d) 75

53. How many moles of Br atoms are there in 0.41 mole of bromoform, CHBr₃?

a) 3 b) 0.41 c) 1.23 d) 1.64 e) 1.5 x 10²³

54. How many grams of nitrogen dioxide, NO₂ are there in 1.77 moles of NO₂?

a) 1.0 b) 1.77 c) 81.42 d) 46 e) 124

55. How many molecules of TNT (C₇H₅N₃O₆ MW 239) are there in 2.9 moles of TNT?

a) 2.9 b) 1.75 x 10²⁴ c) 6.02 x 10²³ d) 3.01 x 10²³ e) 1.75 x 10²³

56. How many molecules are there in 0.05 g (1 drop) of water?

a) 1.67 x 10²¹ b) 0.0023 c) 2.61 x 10²⁶ d) 3.8 x 10²⁷

57. How many moles are present in 2.01 x 10²³ molecules of CH₄ ?

a) 0.33 b) 3 c) 1 d) 0.5 e) 0.25

58 - 60 Given

2 Fe₂ O₃ + 6 C + 3 O₂ ---------> 4 Fe + 6 CO₂

58. How many moles of CO₂ would be generated from 5 moles of O₂ ?

a) 2 b) 3 c) 6 d) 10 e) 12

59. How many grams of O₂ would be needed to react with 6.0 grams of C ?

a) 8 b) 2.25 c) 6.0 d) 16

60. How many grams of CO₂ would be generated from 1 mole of C?

a) 22 b) 44 c) 66 d) 84 e) 12

Ans: 51a; 52b; 53c; 54c; 55b; 56a; 57a; 58d; 59a; 60b

Wednesday, March 21, 2007 01:28:01 PM