CHEM20ASG3-8-KEY - NAME _KEY_ CHEMISTRY 20 ASSIGNMENT 3-8...

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NAME ___________ KEY _____________ CHEMISTRY 20 ASSIGNMENT 3-8 TOPIC(S) COVERED: Text (126-151) TOTAL MARKS: 50 DIRECTIONS: Read pages 126-151 and complete the following questions. Read each question carefully and place your answer on this sheet. Please show all your work unless otherwise indicated. 1. A sample of gas has a volume of 525 mL at 300 K and 746 mmHg. Find the volume if the temperature increases to 350 K and the pressure increases to 780 mmHg. (4 marks) P 1 = 746 mmHg V 1 = 525 mL = 0.525 L T 1 = 300 K P 2 = 780 mmHg V 2 = ? L T 2 = 350 K V 2 = T 2 P 1 V 1 T 1 P 2 = (350 K)(746 mmHg)(0.525 L) (300 K)(780 mmHg) = 0.586 L 2. A sample of gas has a volume of 75 mL at 19.0 °C and 120 kPa. Predict what its volume would be at 25 °C and 100 kPa. (4 marks) P 1 = 120 kPa V 1 = 75 mL = 0.075 L T 1 = 19.0 °C = 292.15 K P 2 = 100 kPa V 2 = ? L T 2 = 25 °C = 298.15 K V 2 = T 2 P 1 V 1 T 1 P 2 = (298.15 K)(120 kPa)(0.075 L) (292.15 K)(100 kPa) = 0.092 L 1
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3. A chemical researcher produces 15 mL of a new gaseous substance in a laboratory at a
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CHEM20ASG3-8-KEY - NAME _KEY_ CHEMISTRY 20 ASSIGNMENT 3-8...

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