Rhenium (re) is made up of 37.4% 185re and 62.6% 187re. the atomic mass of 185re is 184.953 amu. the atomic mass of 187re is 186.958 amu. what is the average atomic mass of rhenium?

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

What is the independent variable in this investigation? mass volume sample number substance density

What is the mass of 0.46 mil of mgcl2