This exercise will lead you to verify that the average atomic mass of magnesium is 24.31 amu, based on the following information: isotope mass (amu) percent abundance
24Mg 23.985042 78.99%
25Mg 24.985837 10.00%
26Mg 25.982593 11.01%
The average atomic mass is the weighted average of the atomic masses of all isotopes.
What is the fractional abundance of 24Mg?

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering

In which region is the substance in both the solid phase and the liquid phase? 1 2. 3 4 mark this and return save and exit next

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ