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Index
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Chemistry30/12/2020
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Chapter 1
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Level 1
level: Level 1
Questions and Answers List
level questions: Level 1
Question
Answer
Chlorous acid, HClO2, contains what percent hydrogen by mass? A) 1.92% B) 25.0% C) 23.4% D) 1.47% E) 5.18%
D
A substance, A2B, has the composition by mass of 60% A and 40% B. What is the composition of AB2 by mass? A) 40% A, 60% B B) 50% A, 50% B C) 27% A, 73% B D) 33% A, 67% B E) none of these
C
Each molecule of testosterone contains 19 atoms of carbon (plus other atoms). The mass percent of carbon in testosterone is 79.12%. What is the molar mass of testosterone? A) 576.8 g/mol B) 180.5 g/mol C) 228.2 g/mol D) 240.1 g/mol E) 288.4 g/mol
E
Indium reacts with chlorine to form InCl3. In the balanced equation for this reaction, the coefficient of the indium trichloride is A) 1 B) 2 C) 3 D) 4 E) 6
B
You heat 3.869 g of a mixture of Fe3O4 and FeO to form 4.141 g Fe2O3. The mass of oxygen reacted is A) 0.272 g B) 0.476 g C) 1.242 g D) 1.000 g E) none of these
A