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Web Quiz 2

# Web Quiz 2 - Question 1 Vitamin C contains the elements C H...

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Question # 1 Vitamin C contains the elements C, H, and O. It is known to contain 40.9% C and 4.58% H by mass. The molar mass of vitamin C has been found to be about 180. The molecular formula for vitamin C is: A. C 2 H 3 O 2 B. C 3 H 4 O 3 C. C 4 H 6 O 4 D. C 6 H 8 O 6 Question # 2 w PCl 5 + x H 2 O y POCl 3 + z HCl The above equation is properly balanced when A. w = 1, x = 2, y = 2, z = 4 B. w = 2, x = 2, y = 2, z = 2 C. w = 2, x = 2, y = 2, z = 1 D. w = 1, x = 1, y = 1, z = 2 E. none of these Question # 3 A substance, A 2 B, has the composition by mass of 60% A and 40% B. What is the composition of AB 2 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 Question # 4 For which compound does 0.256 mole weigh 12.8 g?

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A. C 2 H 4 O B. CO 2 C. CH 3 Cl D. C 2 H 6 E. none of these Question # 5 When 20.0 g C 2 H 6 and 60.0 g O 2 react to form CO 2 and H 2 O, how many grams of water are formed? A.
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Web Quiz 2 - Question 1 Vitamin C contains the elements C H...

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