Pre-Lab Questions "Counting by weighing" is used in other applications besides chemistry. A hardware store, for example, may sell nails in packages of 500. Similarly, the office supply store probably car- ries boxes that contain 100 paper clips. Do you think someone counts out by hand every nail or paper clip in these products? 1. The average mass of one paper clip is 0.39 g. What is the expected mass of 100 paper clips? 2. A paper clip manufacturer finds it more efficient to package paper clips in 100-gram lots. How many paper clips would be contained in a 100-g package? 3. In designing a label for this package of paper clips, how many paper clips would you rec- ommend the label advertise?

Pre-Lab Questions "Counting by weighing" is used in other applications besides chemistry. A hardware store, for example, may sell nails in packages of 500. Similarly, the office supply store probably car- ries boxes that contain 100 paper clips. Do you think someone counts out by hand every nail or paper clip in these products? 1. The average mass of one paper clip is 0.39 g. What is the expected mass of 100 paper clips? 2. A paper clip manufacturer finds it more efficient to package paper clips in 100-gram lots. How many paper clips would be contained in a 100-g package? 3. In designing a label for this package of paper clips, how many paper clips would you rec- ommend the label advertise?

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Chapter6: Chemical Composition

Section: Chapter Questions

Problem 17A

See similar textbooks

Similar questions

Saccharin, a molecular model of which is shown below, is more than 300 times sweeter than sugar. It was first made in 1807, when it was common practice for chemists to record the taste of any new substances they synthesized. (a) Write the molecular formula for the compound, and draw its structural formula. (S atoms are yellow.) (b) If you ingest 125 mg of saccharin, what amount (moles) of saccharin have you ingested? (c) What mass of sulfur is contained in 125 mg of saccharin?
A jar contains some number of jelly beans. To find out precisely how many are in the jar, you could dump them out and count them. How could you estimate their number without counting each one? (Chemists need to do just this kind of bean counting when they work with atoms and molecules. Atoms and molecules are too small to count one by one, so chemists have worked out other methods to determine the number of atoms in a sample.)
Suppose Avogadro’s number was 1000 instead of 6.0221023 . How, if at all, would this affect the relative masses on the periodic table? How, if at all, would this affect the absolute masses of the elements?
Suppose that the atomic mass of C-12 is taken to be 5.000 amu and that a mole is defined as the number of atoms in 5.000 kg of carbon-12. How many atoms would there be in one mole under these conditions? (Hint: There are 6.0221023 C atoms in 12.00 g of C-12.)
n chemistry, what is meant by the term mole? What is the importance of the mole concept?
Calculate the mass of carbon in grams, the percent carbon by mass, and the number of individual carbon atoms present in each of the following samples. l type="a"> 7.8 19 g of carbon suboxide, C3O2 i>1.531021 molecules of carbon monoxide 0.200 mole of phenol, C6H6O
2.37 Why are empirical formulas preferred for describing polymer molecules?
True or false? The atom with the largest subscript in a formula is the atom with the largest percent by mass in the compound. If true, explain why with an example. If false, explain why and provide a counter example. In either case, provide mathematical support.
If you had a mole of U.S. dollar bills and equally distributed the money to all of the people of the world, how rich would every person be? Assume a world population of 7 billion.
How many chlorine atoms are in each of the following? a.124CCl4moleculesb.38HClmoleculesc.89CF2Cl2moleculesd.1368CHCl3molecules
An element X bas five major isotopes, which are listed below along with their abundances. What is the element? Isotope Percent Natural Abundance Mass (u) 46x 8.00% 45.95232 47x 7.30% 46.951764 48x 73.80% 47.947947 49x 5.50% 48.947841 50x 5.40% 49.944792