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Exam question as chemistry unit 1 watch

1. 5)
An important reaction which occurs in the catalytic converter of a car is

2CO(g) + 2NO(g) ---> 2CO2(g) + N2(g)

In this reaction, when 500 cm3
of CO reacts with 500 cm3
of NO at 650 °C (the operating temperature of the catalyst) and at 1 atm, the total volume of gases produced

at the same temperature and pressure is

A 500 cm3
B 750 cm3
C 1000 cm3
D impossible to calculate without knowing the molar volume of gases under these
conditions.

Thank You..
2. You've got 4 mols of gas on the left side of the equation and 3 mols on the right side. 4 mols of gas at this temperature and pressure is 1000cm2 (500 of CO + 500 of NO), so 1 mol would be 250cm2. On the right, you've got 3 mols of gas, so 3 x 250 = 750cm2. Hope that makes sense.

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Updated: January 2, 2013
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