1. The volume of a sample of hydrogen gas was decreased from 11.03 L to 4.32 L a
ID: 990463 • Letter: 1
Question
1. The volume of a sample of hydrogen gas was decreased from 11.03 L to 4.32 L at constant temperature. If the final pressure exerted by the hydrogen gas sample was 8.41 atm, what pressure did the hydrogen gas exert before its volume was decreased? (atm?)
2.A balloon filled with helium has a volume of 12.1 L at 283 K. What volume will the balloon occupy at 251 K? (L?)
3. A sample of an ideal gas has a volume of 2.25 L at 288 K and 1.05 atm. Calculate the pressure when the volume is 1.93 L and the temperature is 308 K. (atm?)
4. If 9.33 moles of an ideal gas has a pressure of 2.39 atm, and a volume of 63.49 L, what is the temperature of the sample? (K?)
5. In the following reaction, how many liters of oxygen, O2, measured at STP, would be produced from the decomposition of 273 g of potassium chlorate, KClO3? (L?)
2KClO^2(s):::::>2KCl(s)+3O^2(g)
6. After an afternoon party, a small cooler full of ice is dumped onto the hot ground and melts. If the cooler contained 5.90 kg of ice and the temperature of the ground was 45.0°C, calculate the energy that is required to melt all the ice at 0°C. The heat of fusion for water is 80.0 cal/g.(cal?)
7. How much heat energy is required to convert 42.8 g of solid iron at 27 °C to liquid iron at 1538 °C? The molar heat of fusion of iron is 13.8 kJ/mol. Iron has a normal melting point of 1538 °C. The specific heat capacity of solid iron is 0.449 J/g·°C.(KJ?)
8. Sort each of the following events based on whether the solubility of the indicated gas will increase, decrease, or stay the same. Each phrase specifies the gas involved and the change in its environment. Note: If any part of this question is answered incorrectly, a single red X will appear indicating that one or more phrases have been placed incorrectly.
9. If 7.08 g of CuNO3 is dissolved in water to make a 0.320 M solution, what is the volume of the solution? (ml?)
10. 65.0 mL of a 1.30 M solution is diluted to a total volume of 228 mL. A 114-mL portion of that solution is diluted by adding 163 mL of water. What is the final concentration? Assume the volumes are additive. (M?)
Explanation / Answer
1. The volume of a sample of hydrogen gas was decreased from 11.03 L to 4.32 L at constant temperature. If the final pressure exerted by the hydrogen gas sample was 8.41 atm, what pressure did the hydrogen gas exert before its volume was decreased? (atm?)
Apply the ideal gas law ratios
P1V1 = P2V2
substitute known data
11.03 * P1 = 8.41*4.32
P1 = 8.41*4.32/11.03 = 3.29385 atm
then
the initial pressure was 3.29385 atm
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