Nitrogen dioxide, , decomposes upon heating to form nitric oxide and oxygen according to the following equation: At the beginning of an experiment, the concentration of nitrogen dioxide in a reaction vessel was 0.1103 mol/L. After 64.0 s, the concentration decreased to 0.1054 mol/L. What is the average rate of decomposition of during this time interval in mol/(L·s)?

-7.66 x 10^-5 mol/L per second.

Explanation:

You find the avg. rate of decomposition by finding the overall amount of matter decomposed and dividing it by the time the mixture/substance decomposed for. In this case, it would be (0.1054 mol/L - 0.1103 mol/L ) / 64.0 s.

This gives you -0.0000766 mol/L per second (using significant figures rules), or -7.66 x 10^-5 mol/L per second.

Cheers.