Last modified: Tue 10/01/2013 09:51:18 pm
BCE

Oklahoma State University

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Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.


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1. In the periodic table each element is identified by a one or two letter symbol and two numbers. One of the numbers is an integer and the other number is a decimal.

a) What is the term we use to identify the integer number for each element?

b) What information does the integer number provide about the element?

c) What is the term we use to identify the decimal number for each element?

d) What are the units on the decimal number?

e) What information does the decimal number provide about the element?

2. What is the mass, in amu's, of an atom of carbon? amu

3. What is the mass, in amu's of two atoms of carbon? amu

4. What is the mass, in amu's, of a molecule of methane, CH4? amu

5. What is the mass, in grams, of an atom of carbon? g (NOTE: 1 amu = 1.66054 x 10-24 g)

6. What is the mass, in grams, of a molecule of methane, CH4? g

7. What is the mass in grams of a formula unit of Na3PO4? grams

8. What is the mass in grams of 6.023 x 1023 molecules of methane, CH4? grams

9. In chemistry a mol is the term used to describe an amount of substance that contains 6.023 x 1023 units (atoms/molecules/formula units) of that substance. For example, 1 mol of CH4 molecules contains 6.023 x 1023 molecules of CH4. So we could ask Q8 a slightly different way,

10. What is the mass of 1 mol of methane, CH4? grams

11. How many mol of methane are in 32.0 grams of methane? mol CH4

12. How many mol in 48.0 grams of HCN? mol HCN

13. How many mol of oxygen atoms in 0.0500 mol of Fe3O4? mol O atoms

14. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

15. If there is one question you would like to have answered in lecture, what would that question be?