Question

Iron ore is reduced to pure iron by smelting, during which the iron (iii) oxide in the ore reacts with carbon monoxide gas, like this: fe2o3s + 3cog → 2fes + 3co2g suppose an engineer decides to study the rate of this reaction. she prepares four reaction vessels with 158.8g of solid iron (iii) oxide and 33.9g of carbon monoxide gas each. the volume and temperature of each vessel is shown in the table below. arrange the reaction vessels in decreasing order of initial rate of reaction. in other words, select a "1" next to the vessel in which the engineer can reasonably expect the initial rate of reaction to be highest, a "2" next to the vessel in which the initial rate of reaction would be next highest, and so on. vesselvolumetemperatureinitial rate of reaction a 2.0l 1100.°c b 2.0l 1200.°c c 4.0l 1100.°c d 4.0l 1000.°c

Answer 1

Let us first investigate the volume effects. From the ideal gas equation, we know that pressure and volume are inversely proportional. The rate of reaction would be faster if the volume is smaller which makes the pressure higher. So, a volume of 2.01 is more favorable than 4.01. 

Next, we have to know the enthalpy of reaction. For this reaction, it is ΔH = -28 kJ. For a negative enthalpy, it would favor the higher temperature. Therefore, the order of rates of reaction is:

1.B
2.A
3.C
4.D

Answer 2

Answer:

1 b

2 a

3 c

4 d

Explanation:

The reaction rate will be negative. As can seen from the temperature profile, the temperature keeps on increasing. This gives a negative enthalpy of reaction. Thus, $\delta H_{reaction}$ = negative.