Feedback:Empirical Formula discussed in Chapter 6.2.
Question 7 of 25
0.0/ 4.0 Points
`I was wading in the creek and discovered what I thought to be a small meteorite. I took it home
and found its mass to be 5.50 kg. I ran some fancy schmancy chemical tests on it, and
determined that the mass ...
Your grades have been posted and your short answer questions graded with comments. Thanks! Prof Heath
Part 1 of 3 - 24.0/ 52.0 Points
Question 1 of 25
4.0/ 4.0 Points
A compound responsible for the odor of garlic has a molecular weight of 146 g/mol. A 0.650 g sample of the compound contains 0.321 g of carbon, 0.044 g of hydrogen, and 0.285 g of sulfur. What is the molecular formula of the compound?
A. C3H5S
B. C3H15S3
C. CH5S
D. C6H10S2 Feedback:Great! Empirical Formula discussed in Chapter 6.2.
Question 2 of 25
4.0/ 4.0 Points
`I was planting a tree in my backyard and hit something hard. I dug it out and decided it was an ore of copper. I took its mass, and it was 65.0 grams. After some tricky experiments in my basement lab, I managed to extract 11.5 grams of copper. What is the mass percent of copper in the ore I discovered?
A. 63.5%
B. 18.1%
C. 5.65%
D. 17.7%
Feedback:Great! Mass percent discussed in Chapter 6.2.
Question 3 of 25
0.0/ 4.0 Points
`Benzoic acid (C7H6O2) is a common over-the-counter medication for mild acne. What is the mass
percent of carbon in this medicine?
A. 4.95%
B. 68.8
C. 26.2%
D. 46.7%
Feedback:Mass percent discussed in Chapter 6.2.
Question 4 of 25
0.0/ 4.0 Points
`I have some aliens in my basement who have developed a chemical weapon in an attempt to escape. I was able to survive the first attack and capture a sample of the dangerous gas. I analyzed it to find that it had a molar mass of 648.52 grams, and its empirical formula is C5H11N2O2P. What is its molecular formula?
A. C20H44N8O8P4
B.
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