Last modified: Mon 02/10/2014 10:36:04 pm
BCE

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

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

3. How many moles in 48.0 grams of HCN? mol HCN

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

5. We need to understand a little more about formulas, so consider the formula for glucose, C6H12O6.

a) Is this the formula of a covalent compound or an ionic compound?

b) How many carbon atoms in one molecule of glucose?
C atoms

c) How many oxygen molecules, O2, in a glucose molecule?
O2 molecules

d) Complete the following table?

Element

Number of atoms in glucose, C6H12O6

Atomic Mass

Mass of element contributed to mass of glucose

C

6

12.011

72.066

H

O

6. What % of the total mass of glucose is contributed by carbon?
%

7. What % of the total mass of glucose is contributed by hydrogen?
%

8. What % of the total mass of glucose is contributed by oxygen?
%

9. How many grams of carbon atoms are contained in 100. grams of glucose?
grams

10. How many grams of hydrogen atoms are contained in 100. grams of glucose?
grams

11. How many grams of oxygen atoms are contained in 100. grams of glucose?
grams

12. Which of the following compounds has the highest percentage of oxygen?

PbO, MgO, CO, Cl2O or SO2

Write the formula of the compound...

13. Briefly explain how you arrived at your answer in Q12.

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?