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Do Now

Do Now. Complete the do now problems on your handout. Even if you do not know, you need to take a guess. Do now answers. 3458 torr 990.3 mmHg 55600 mL (Use 1L = 1000 mL as a conversion factor) 2.275 moles of He (Use molar mass as conversion factor)

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Do Now

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  1. Do Now Complete the do now problems on your handout. Even if you do not know, you need to take a guess.

  2. Do now answers • 3458 torr • 990.3 mmHg • 55600 mL (Use 1L = 1000 mL as a conversion factor) • 2.275 moles of He (Use molar mass as conversion factor) • Move faster – More collisions – Higher temperature • Fewer collisions – lower pressure

  3. Ideal Gases • The KMT is based on the concept of ideal gases… • Ideal gases would follow the KMT EXACTLY • No real gases follow the KMT perfectly, but they approximate those conditions

  4. PV = nRT Pressure atm; kPa; mmHg; Torr L Volume # of moles mole We will always use 0.0821 L-atm/mol-K Gas constant Kelvin (to convert to K from Celsius add 273 to Celsius temp) Temperature

  5. Standard conditions (STP) • There will be times when you will be told that a gas is at standard temperature and pressure (STP). The following conditions are STP: Temperature = 273 K Pressure = 1 atm

  6. Algebra is EVERYWHERE! PV=nRT

  7. Steps to solve All Ideal Gas Law Problems 1. Underline the given values, and circle the unknown. (Like we have been doing already) 2. Check to make sure all units are in L, atm, mol, and K. 3. SOLVE!

  8. Example 1: Calculate the volume of 10.0 moles of He gas at a pressure of 300. kPa and 50.0 C Step 1: Step 2: Step 3:

  9. Example 2: Calculate the volume of 1.00 mol of H2gas at 0 degrees C and 1 atm.

  10. Whiteboard:How many moles of a gas at 100ºC does it take to fill a 1.00-L flask to a pressure of 1.50 atm?

  11. Whiteboard:If 4 moles of a gas at a pressure of 567 kPa fill a volume of 12 L, what is the temperature of the gas?

  12. Independent Practice • Complete the IP on your own, silently. This is to ensure that you are ready for tomorrow’s quiz. • Once you complete the IP, you will be given tonight’s HW to work on. • If you do not finish the IP, you will pick up the homework on your way out.

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