Chapter 2, Problem 2.46E

Consider a sample of silver weighing 30OE0 g. How many at oms of silver are present in the sample? What mass of copper would you need for the copper sample to contain the same number of atoms as the silver sample?

How many moles are contained in a 54.0g sample of Al? a. 1.0 b. 2.0 c. 0.5 d. 4.0

Use a factor derived from the relationships written in Exercise 2.44 and the factor-unit method to determine the following: a.The mass in grams of one phosphorus atom b.The number of grams of aluminum in 1.65mol of aluminum c.The total mass in grams of one-fourth Avogadros number of krypton atoms

How many chlorine atoms are in each of the following? a.124CCl4moleculesb.38HClmoleculesc.89CF2Cl2moleculesd.1368CHCl3molecules

In chemistry, what is meant by the term mole? What is the importance of the mole concept?

Give the name and value of the number associated with the mole.

Consider separate equal mass samples of magnesium, zinc, and silver. Rank them from greatest to least number of atoms and support your answer.

(Show all calculations where appropriate.) 1. A student measured a 6.790 g sample of a hydrated salt. After heating, the mass of anhydrous salt was found to be 4.501 g. Use these data to calculate: a) The mass of water in the hydrated salt. b) The percent by mass of water in the hydrated salt. 2. If you have covered the topic of "the mole" in class, answer this question. Hint: Re-read the example in the introduction. 4.64 g of Na,SO,*xH,O were heated to yield 2.84 g of Na,SO4. What is the value of x?

19. A certain sample of dichlorine heptoxide consists of 4200 oxygen atoms combined with chlorine atoms. How many chlorine atoms are contained in the sample? A. 8400 oxygen atoms B. 4200 oxygen atoms C. 2100 oxygen atoms D. 1200 oxygen atoms 600 oxygen atoms E.