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Non STP Problems

Non STP Problems. Jake Rausch & Garrett Schoenly Period 1. Click the arrow to begin. Directions. Use the arrows at the bottom of the page to move forward and backward through the tutorial In the quiz click on the block to advance. MASS-Volume Problems.

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Non STP Problems

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  1. Non STP Problems Jake Rausch & Garrett Schoenly Period 1 Click the arrow to begin

  2. Directions • Use the arrows at the bottom of the page to move forward and backward through the tutorial • In the quiz click on the block to advance

  3. MASS-Volume Problems • Mg(s) + O2(g) MgO(s) with 5g of Mg at STP • First Step: Balance the equation • 2Mg(s) + O2(g) 2MgO(s) • Second Step: Find the grams/mole of the solids (using the periodic table) • 2Mg(s) + O2(g) 2MgO(s) 24 g/m 40 g/m • Third Step: At STP the liters/mole is 22.4 • 2Mg(s) + O2(g) 2MgO(s) 24 g/m 22.4 L 40 g/m

  4. Mass-volume problems (cont) • Fourth Step: Find moles by dividing the grams by the grams/mole 5g 2Mg(s) + O2(g) 2MgO(s) 24 g/m 22.4 L 40 g/m 0.208m • Fifth Step: Use the mole ratio to determine the moles of the other components 5g 2Mg(s) + O2(g) 2MgO(s) 24 g/m 22.4 L 40 g/m 0.208m 0.104m 0.208m

  5. Mass-volume problems (cont) • Sixth Step: Multiply the other moles by their grams/mol or liters/mol 5g2.32L 8.32g 2Mg(s) + O2(g) 2MgO(s) 24 g/m 22.4 L/m 40 g/m 0.208m 0.104m 0.208m

  6. Why do we use 22.4 l/m? • To achieve the value of 22.4, you take any GAS find its molecular mass and multiply that number by 1 liter divided by the gas’s density. (located in the CRC handbook) • Ideal Gas Law • PV=nRT • V/n= (RT)/P R = 8.31 (Constant) • At STP Temp. = 273 K, Pressure = 101.325 KPA • V/n = (8.31)(273K)/(101.325 KPA) • V/n = 22.4 Liters/mole

  7. Finding L/m at non-stp • Pv=nRT • V/n = (RT)/(P) • Find the Liters/mole if temp = 20 degrees C, and the pressure = 600 torrs • 1) convert temp. to kelvin and pressure to KPa • 20 C + 273 = 293 K • 600torr x (1/760) x (101.325/1) =80 KPa • V/n = (8.31 x 293) / (80) • V/n = 30.4 L/M

  8. Find mass-volume problem at non-stp • Repeat the same steps as in the example shown for STP • Except instead of using 22.4 L/m to find the liters you find the liters/mole (V/n), using the equation on the previous side.

  9. example • Find the volume in Liters of oxygen and hydrogen when the pressure is at 167.97 Kpa and the temperature is 68 degrees C? 18g • H2O  H2 + O2 18g 16.87l 8.44l • 2H2O(L) 2H2(g) + O2(g) 18g/m 16.87l/m 16.87l/m 1m 1m 0.5m

  10. example • Do not forget to convert your units • V/N = RT/P • V/N = (8.31Kpa/mK)(341K)/(167.97KPa) • Figure out the equation • V/N= 16.87 liters/ 1 mole 18g 16.87l 8.44l • 2H2O(L) 2H2(g) + O2(g) 18g/m 16.87l/m 16.87l/m 1m 1m 0.5m

  11. Questions • First Question: • If the temperature is in Celsius degrees and the pressure is in torrs. Temperature has to be in Celsius. TRUE FALSE

  12. Oops, sorry that’s inncorrect • Because of the constant 8.31 Kpa/MoleKelvin, the temperature has to be in Kelvin and the pressure has to be in Kpa Back to question 1

  13. Correct, Now Question #2 • If the pressure is 952 Torrs, what is the pressure in Kpa? 1.253 Kpa 126.923 Kpa 9.396 Kpa

  14. Oops, sorry that’s inncorrect • To find Kpa from torrs divide by 760 and then multiply by 101.325 Go back to question 2

  15. Correct, now question #3 • Find the liters per mole when the temperature in 27 degrees Celsius and the pressure is 2.00 atm. 1.11 L/M 2.21 L/M 448.74 L/M 12.3 L/M

  16. Oops, sorry that’s inncorrect • V/n = (RT)/P • Remember to convert temperature and pressure Go back to question 3

  17. Correct, Now question #4 • Find the volume of oxygen in the equation: • Cu(s) + O2(g)  CuO • When there is 50g of Cu and the temperature is 200 K and the pressure is 70 Kpa 8.31L 9.35 L 10.78 L 12.98 L

  18. OOPS, Sorry That’s Incorrect • Did you remember to convert everything? • What about balance the equation? Go Back to Question 4

  19. Correct, now one last question • Find the volume of the oxygen and the nitrogen monoxide in the equation: • NO(g) + O2(g)  NO2(g) • When there is 40.4 L of NO2 and the pressure is 800 torrs and the temperature is 50 degrees C NO = 1.61 L O2 = 20.2 L NO = 1.59 L O2 = 21.7 L NO = 4.78 L O2 = 24.4 L NO = 56.98 L O2 = 23.75 L

  20. Oops, sorry that’s incorrect • Make sure you convert everything necessary • Use the formula V/n = Rt/P Go Back to Question 5

  21. Works Cited • All work was provided by the notes taken in Mr. Wolfe’s class this year and in Chem 1.

  22. Congratulations You have successfully completed the non-STP problems tutorial

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