SCIN131 Week 04 Quiz - Lesson 04 - Questions with 100% Correct Answers Latest Update 2024 - Verified

Part 1 of 3 - 44.0/ 52.0 Points Question 1 of 25 4.0/ 4.0 Points `Eureka! I've discovered a new compound! Yay for me. I have determined that its empirical formula, but in order to determine its actual molecular formula, I need to know which of the following? • A. the number of moles of the compound in a 1.00 g sample of the substance • B. the density of the compound • C. the boiling point and freezing point of the compound • D. the molar mass of the compound. • E. none of these Feedback:Great! Empirical Formula discussed in Chapter 6.2. Question 2 of 25 4.0/ 4.0 Points Dihydrogen monoxide is the formula for a substance that makes up about 60% of the human body. What is mass percent of hydrogen in this compound? • A. 1.01% • B. 10.1% • C. 88.8% • D. 11.2% Feedback:Great! Mass percent discussed in Chapter 6.2. Question 3 of 25 4.0/ 4.0 Points `Before 1982, pennies were made of copper. From 1983 on, they are made of zinc, and only thinly plated with copper. The purity of those pre-1982 pennies are really about 95% copper (5% zinc and tin), but from they were actually pure copper. If you had a penny from 1820 that had a mass of 3.11 grams, how many atoms of copper would you have?