30) Which of the following is true about ideal gasses? a. only homoatomic diatom

Question

30) Which of the following is true about ideal gasses? a. only homoatomic diatomic gasses can be considered ideal gasses b. most gasses can be treated as ideal gasses at average temperatures and pressures c intermolecular cohesive forces are nonexistent in ideal gas systems d. only noble gasses can be considered ideal gasses e. more than one of the choices (a through d) above is true about ideal gasses 31) At a pressure of 475 mm Hg and a temperature O 'C, a sample of O2 has a volume of 1.46 L. What will be the new volume of this sample if the pressure is reduced to 375 mm Hg and the temperature is increased to 36 C? YOU MUST SHOW YOUR WORK. PLACE ANSWER HERE 32) For the reaction: C2H4(g) + O2 (g) CO2(g) + H2O(g) If 10.0 mol of CO2 are produced, how many moles of O2 were reacted? a. 4.0 mol b. 7.5 mol c. 9.0 mol d. 15.0 mol e. 18.0 mol f none of the answers (a through e) above is correct

Explanation / Answer

30. answer: c

31. P1V1/T1 = P2V2/T2

   ((475/760)*1.46)/273.15 = ((375/760)*V2/(36+273.15)

V2 = final volume of O2 gas = 2.1 L

32. balanced equation : C2H4 + 3O2 ---> 2CO2 + 2H2O

    2 mol CO2 = 3 mol o2

    10 mol CO2 = 3*10/2 = 15 MOL

ANSWER: d.15 mol

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