1. C

    Uncertainty of an average

    Hello! Today I was attempting to do some calculations from a lab that I did last week. I did most of them, however, now it asks me to present my average for my agreeing values, with their respective absolute uncertainty. The lab was an experiment to determine the hardness of a water sample...
  2. N

    Average atomic mass?

    The atomic weight of a newly discovered element is 98.225 amu. It has two naturally occuring isotopes. One isotope has a mass of 96.780 amu. The second isotope has a percent abundance of 41.7%. What is the mass of the second isotope? 1. 99.670 amu 2. 57.265 3. 99.259 amu 4. not enough...