Chemistry Question? How to find the answer?

Posted on 2014-12-17 06:24:00 in Chemistry by ANIMO

Multiple Choice

1. What is the value of ?H in the following reaction: H?O(g) ? H?O(l)?



a. -44 kJ



b. 44 kJ



c. -527.6 kJ



2. At 25.0?C, the heat flow of a reaction system was measured to be -21.35 kJ. If the heat capacity of the system is 2.41 kJ/?C, what was the final temperature?



a. 51.5?C

b. 16.1?C

c. 26.0?C



3. When 1.34 g KBr dissolves in 74.0 g of water in a coffee-cup calorimeter, the temperature drops from 18.000?C to 17.279?C. What is q when KBr dissolves?



a. 223 J

b. -223 J

c. 134 J



4. What is the value of q when one mole of KBr dissolves under the same conditions as described in question 3?



a. 18.9 kJ

b. 19.8 kJ

c. -19.8 kJ



5. What is the value of ?H? for the following reaction if one mole of nitrogen is formed? 4NH?(g) + 3O?(g) ? 2N?(g) + 6H?O(g)



a. 765.2 kJ



b. -765.2 kJ



c. -633.2 kJ



6. In question five, what is the value of ?H? if 4.5 moles of water are formed?



a. -949.8 kJ

b. -1147.8 kJ

c. -422.1 kJ



7. During an experiment, it was found that -136.5 kJ of energy were necessary to raise the temperature 17.67?C. What is the heat capacity of this bomb calorimeter?



a. -7.725 kJ/?C



b. 7.725 kJ/?C



c. 0.1295 kJ/?C

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