Uhh how do I do nuclear decay ( please explain the equation im failing chem)

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

The molecular weight of carbon dioxide, co2, is 44.00 amu, and the molecular weight of nitrous dioxide, no2, is 46.01 amu, so no2 diffuses co2

What sources of error may have contributed to the percent yield not being 100 percent? think about things that may have led to inaccurate measurements or where mass of the product could have been lost if this experiment was conducted in a physical laboratory.