30. Which of the following is the smallest amount of CO (gas)? (A) 100 amu (B) 2
ID: 541430 • Letter: 3
Question
30. Which of the following is the smallest amount of CO (gas)? (A) 100 amu (B) 22 grams (C) 11.2 liters (D) One mole 31. Which of the following samples has the greatest number of molecules? (A) 17 grams of water (H20) (B) 17 grams of methane (CH4) (C) 17 grams of carbon dioxide (CO2) (D) 17 grams of ammonia (NH3) 32. Consider the following half-reactions in a fuel cell. half-reaction 1: half-reaction 2: 02(9)+4e +4H Which statement is correct? 2H2(g) 4H++ 4e - 2H,0(9) (A) In half-reaction 1, 02(g) is oxidized. (B) In half-reaction 1, H2(g) is oxidized (C) In half-reaction 2, H:(g) is oxidized. (D) In half-reaction 2, O(g) is oxidized. 33. Consider the following half-reactions in a fuel cell. half-reaction 1: 2H2(g)-4H, 4e" Q(g) +4e.4hr-2H20(g) half-reaction 2: Which statement about the energy generated by the total reaction (half-reaction 1+ half- reaction2) in the fuel cell compared to the energy generated by burning H:lg) in a combustion engine? A) The fuel cell reaction generates more energy than burning H2 in a combustion engine. (B) The fuel cell reaction generates less energy than burning H2 in a combustion engine. (C) The fuel cell reaction generates the same amount of energy as burning H2 in a combustion engine (D) Science cannot answer this question yet. The questions like this are actively researched by the US department of EnergyExplanation / Answer
30. 0ne mole
31. no of molecules = W*6.023*10623/G.M.Wt
= 17*6.023*10^23/18 = 5.68*10^23 molecules of H2O
no of molecules = W*6.023*10623/G.M.Wt
= 17*6.023*10^23/16 = 6.4*10^23 molecues of CH4
no of molecules = W*6.023*10623/G.M.Wt
= 17*6.023*10^23/44 = 2.33*10^23 molecules of NH3
no of molecules = W*6.023*10623/G.M.Wt
= 17*6.023*10^23/17 = 6.023*10^23 moles of NH3
B. 17g of CH4 >>>>>answer
32. 2H2(g) -----------> 4H^+ + 4e^-
The oxidation number of H2 is increases from 0 to +1. It is oxidation
B. In half reaction 1, H2(g) is oxidized.
33.A The fuel cell reaction generates more energy than buring H2 in a combustion
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