SCIN131 Quizess Week 4 (Questions with Correct Answers) Latest Graded

SCIN131 Quizess Week 4 (Questions with Correct Answers) Latest Graded. The empirical formula of an organic molecule is CH; its molar mass is 104.1 g/mol. What is the molecular formula of the molecule? • A. C10H12 • B. C6H6 • C. None of these. • D. C2H4 • E. C8H8 Feedback:Great! Empirical Formula discussed in Chapter 6.2. Question 6 of 25 4.0/ 4.0 Points Salicyclic acid (C7H6O3) is commonly the active ingredient in face washes designed to help with acne. What is the mass percent of carbon in this compound? • A. 60.9% • B. 3.47% • C. 6.09% • D. 34.7% Feedback:Great! Mass percent discussed in Chapter 6.2. Question 7 of 25 4.0/ 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 12.00 kg. I ran some fancy schmancy chemical tests on it, and determined that the mass of nickel within the sample was 300.0 grams. What is the mass percent of nickel in the meteorite? • A. 25.00% • B. 4.000% • C. 2.500% • D. 100.0% Feedback:Great! Mass percent discussed in Chapter 6.2. Question 8 of 25 4.0/ 4.0 Points `A compound known as deuterium oxide, or "heavy water" is sometimes used in nuclear research. It is water, but each hydrogen atom in a "heavy water" molecule has a neutron in the nucleus in addition to the normal proton. So, what would be the percent hydrogen (by mass) in a "heavy water" molecule? • A. 20.1% • B. 79.9% • C. 11.2% • D. 88.8% Feedback:Great! Mass percent discussed in Chapter 6.2. Question 9 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 of nickel within the sample was 250.0 grams. What is the mass percent of nickel in the meteorite? • A. 0.5454% • B. 0.4545% • C. 4.545% • D. 45.45% Feedback:Mass percent discussed in Chapter 6.2. Question 10 of 25 4.0/ 4.0 Points A sample of pure lithium carbonate contains 18.8% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample? • A. 75.2% • B. 37.6% • C. 18.8% • D. 9.40% Feedback:Great! Mass percent discussed in Chapter 6.2. Question 11 of 25 4.0/ 4.0 Points `One of the first chemical WMDs, researchers initially produced VX nerve agent for retail sale in the 1950s as a pesticide. Thankfully, your likelihood of coming in contact with VX is extremely low - the world's stockpiles have been destroyed, including the United States' main stockpile in Anniston, AL. The molecular formula for this nerve agent is C11H26NO2PS, and it has a molar mass of 267.37 g/mol. Given this information, what is its empirical formula?