Please help with these both thank you! will rate! 59. Questions 59-60 relate to

Question

Please help with these both thank you! will rate!

59. Questions 59-60 relate to the following information. Platinum metal catalyzes the oxidation of CO(g) to react with air to form COg). Approximately 3 to 9 grams of platinum are used in a car catalytic converter. A thin layer of the metal is coated over a silicon oxide ceramic honeycomb. Which of the following correctly explains why the platinum is coated over the silicon oxide honeycomb rather than using a single plate of pure platinum? (A) The ceram (B) The platinum's surface area is increased by coating it on the ceramic honeycomb allowing for ic enhances the platinum's ability to act as a catalyst by providing a solid substrate. more contact area with the carbon monoxide. that the carbon monoxide will react with the platinum catalyst. oxygen. (C) The silicon oxide's oxygen atoms attract the polar oxygen atoms of the carbon monoxide so (D) The silicon oxide will reform the platinum after it has reacted with the carbon monoxide and

Explanation / Answer

59. The correct answer is an option B.

Explanation: The oxidation of CO(g) to CO2(g) is a surface reaction. The conversion of CO into CO2 increases with increase in surface area of the catalyst, i.e. Pt. The surface area of the platinum can be increased by coating it over the silicon oxide honeycomb.

60. The correct answer is an option D.

Explanation: The no. of moles of Pt = 3.90 g/195 g mol-1 = 0.02 mol

Since Pt catalyzes the oxidation reaction of CO into CO2, The no. of moles of Pt should be used less than that of CO.

i.e. No. of moles of CO > NO. of moles of Pt

i.e. No. of moles CO > 0.02 mol

i.e. The mass of CO > 0.02 mol*28 g mol-1 (= 0.56 g)

Therefore, more than 0.56 g of CO will react with 3.90 g of Pt.

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