17. If you have a total pressure of 75 mm Hg for a mixture of O and H:0 gases, a

Question

17. If you have a total pressure of 75 mm Hg for a mixture of O and H:0 gases, and the H:O gas is 12 mm Hg, what is the O2 pressure? a. 63 mm Hg b. 12 atm c. 75 mm Hg d. 87 mm Hg e. 21 atm 18. When you have 22.4 L N2 gas, at 273 K and 1.00 atmosphere, what are the moles of N2? a. 0.300 b. 1.00 c. 2.00 d. 3.00 e. 4.00 19. For a process at constant pressure, 11,400 calories of heat are relcased. This quantity of heat is equivalent to a. 192000 b. 592000 J c. 621000 d. 477000 J e 0.00333 J 20. Which of the following materials would show the smallest temperature change upon gaining 200.0 J of beat? a. 50.0 grams water (specific heat capacity of water 4.184 gc 50.0 grams c. 50.0 grams granite (specific heat capucity of granite 0.79 J(g'c) 50.0 gramas lead (Pb) (specificheat capacity ofPb 0.128 Jogo t of Ag 0.235 JKgC)) d. g"C)) e. 50.0 grams silver (Ag) (specific heat capacity of Ag 0.235 Jgc exothermic reaction, you triple 21. If you triple the amount of reactants and products in an the heat the reaction produces. a. True b. False

Explanation / Answer

Ans 17 : a) 63 mmHg

The total pressure of the mixture of gases is the sum of partial pressures of its gaseous components.

So the O2 pressure = 75 - 12

= 63 mmHg

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