Can someone help me please?

When the volume and number of particles of a gas are constant which of the following is also constant

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?