Last modified: Fri 11/01/2013 11:56:14 am
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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Consider the following equation for the reaction between magnesium metal and oxygen gas.

2Mg(s) + O2(g) ----> 2MgO(s) + 1204 kJ

1a. Is the reaction exothermic or endothermic? (Check your textbook at Figure 6.18.)

1b. Explain.

We can read the above equation: 2 mol of magnesium reacts with 1 mol of oxygen to produce 2 mol of magnesium oxide and 1204 kJ of heat.

2. According to the balanced chemical equation how many kilojoules of heat are transferred when 2 moles of magnesium metal react completely with 1 mol of O2 gas?

kJ

3. How many kilojoules of heat are transferred when .5 moles of magnesium metal react completely with enough O2 gas?

kJ

4. How many kilojoules of heat are transferred when 65.7 g of magnesium metal react completely with enough O2 gas?

kJ

5. How many grams of magnesium must have reacted if 245 kilojoules of heat are transferred?

grams

6a. How many kilojoules of heat are transferred when 3 moles of magnesium oxide decompose into magnesium metal and O2 gas?

kJ

6b. Is the heat calculated in 6a absorbed or released?

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

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