Question R5 Q14 - NSB Round Robin 2018

The molecular mass of atomic oxygen is expressed as 15.9994 plus or minus 0.0003. Which of the following best explains the source of the error?

W) Human error from measurement to measurement

X) Lack of precision in ultra-low weighing techniques

Y) Minute differences in measurement equipment used by different research groups

Z) Isotopic variation in different samples of oxygen

Science Bowl Question