Name: _________________________ Date: _________________ Worksheet 1 – Boyle’s and Charles’ Laws Purpose: To practice Boyle’s, Charles’, and Combined Gas Laws, conversions within pressure units, and to show proficiency in the Kelvin temperature scale. SHOW ALL YOUR WORK (i.e. GRASP)! 1. A 23.4 L sample of gas at a pressure of 98.0 kPa is compressed to a pressure of 135 kPa. What is the new volume of the sample? 2. When 5.67 L of gas at STP is caused to expand to 10.0 L, what is the new pressure within the container? 3. If 77.7 L of nitrogen gas initially at –100.0 °C is cooled to a temperature of – 150.0°C the volume changes. To an accuracy of three significant digits, what is the new volume of the gas sample? Chemistry 20 1 4. A 3.50 L sample of oxygen at SATP has its temperature changed in order for the volume to increase to 5.00 L. The pressure remains unchanged. In Celsius, what is the new temperature of the oxygen? 5. A healthy hen has a body temperature of 39.2 °C. What is her temperature in Kelvin? 6. The melting point of lead is 327.5 °C. What is its melting point in Kelvin? 7. If the pressure at the eye of a hurricane is reported as 0.77 Atm., what is the pressure to the nearest kPa? 8. When a mercury column in a barometer stands at 844 mm Hg, what is the pressure in kPa? 9. A gas sample of 8.50 L at SATP is moved into a lab which has a temperature of 18.0 °C. What is the new volume of the gas sample? 10. A 12.9 L sample of gas initially at 108 kPa is altered when the pressure is increased to 115 kPa. What is the new volume of the gas? Chemistry 20 2 11. A 99.0 L container of gas is initially at 10.0 °C. The temperature is increased to 27.0 °C. What is the new volume of the gas? 12. A helium balloon is filled until its volume is 15.0 L at SATP. The balloon is released and it rises. High in the atmosphere the balloon has a volume of 35.0 L. In kPa, what is the air pressure at this height? [We’re assuming the temperature did not change] 13. If a 13.0 L balloon is taken from the surface of our pool where the pressure is 100.7 kPa to the bottom of our pool we would notice the new volume of the balloon to be 4.11 L. What is the pressure at the bottom of the pool? (Notice that temperature has not been mentioned!) 14. If 12.4 L of gas at SATP is moved to conditions where the temperature is 25.0 °C but the pressure is 555 mmHg. What is the volume of the sample? Chemistry 20 3 15. Initially at human body temperature and 725 mm Hg, a 456 mL sample of gas is cooled to –25.0 °C while having its pressure unchanged. What would be the volume of the sample? 16. (Last) Inside a bottle of root beer in the 4.5 °C refrigerator there is a 0.005 00 mL bubble of carbon dioxide. The pop is under pressure of 1.45 Atm. When the pop is removed from the ‘fridge and opened, the pressure immediately drops to 99.5 kPa, the pressure here in lovely Tofield. [ASSUME that the temperature remains constant at 4.5 °C] What would be the new volume of the potential burp? (small) Chemistry 20 4
