CHEM 24112 Chapter Notes - Chapter 8: Caesium, Fluorine, Unified Atomic Mass Unit

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29 Jun 2018

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Homework 8.1: Atomic Mass and The Mole

1. Define the amu. What is one amu equivalent to in grams?

2. What do we mean by the average atomic mass of an element? What is ‘averaged’ to arrive at this

number?

3. What is the mass, in amu, of an average sodium atom? What would 124 sodium atoms weight?

How many sodium atoms are contained in a sample of sodium that has a mass of 344.85 amu?

4. The atomic mass of tin is 118.7 amu. What would be the mass of 35 tin atoms? How many tin

atoms are contained in a sample of tin that has a mass of 2967.5 amu?

5. Suppose you have a sample of sodium weighing 11.50 g. How many atoms of sodium are present in

the sample? What mass of potassium would you need to have the same number of potassium atoms

as there are sodium atoms in the sample of sodium?

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