Passage I

A reaction is at equilibrium when the rate of the forward reaction equals the rate of the reverse reaction. At equilibrium, the ratio of product concentration(s) to reactant concentration(s) is the equilibrium constant, K.

Consider the following reaction at equilibrium:

X + Y Z

For this reaction, K is given by:

The brackets ([ ]) around the symbol for a substance indicate the equilibrium concentration of the substance.

This reaction was studied in 10 trials. Trials 1-5 were conducted at the same temperature (see Table 1 ) , and Trials 6-10 were conducted at different temperatures (see Table 2).

4. Based on Tables 1 and 2, how many trials were most likely conducted at temperatures above the freezing point of water?

Answer and Explanation

Your Answer is

Correct Answer is H

Explanation

First of all, it can be seen from table 2 that when the temperature is 10 degrees Celsius, K=0.10 indicates that the reaction temperature of trails 1-5 is 10 degrees Celsius;

The reaction temperature of trails 8-10 is also Above 0 degrees, so a total of 8 trails meet the requirements of the question