13. magnesium is commonly extracted from seawater. the table below shows the
isotopes of magnesium that are extracted.
isotopes of calcium
isotope
percent abundance mass
calcium -39
22.70%
39 amu
calcium -40
75.08%
40 amu
calcium-41
2.22%
41 amu
what is the average atomic mass of calcium?

Lithium diisopropylamide [(ch3)2ch]2nli, referred to as lda, enjoys many uses as a strong base in synthetic organic chemistry. it is customarily prepared by the reaction of diisopropylamine [(ch3)2ch]2nh with butyllithium. draw the products of the reactions in the appropriate boxes and select the acid, base, conjugate acid, and conjugate base. be sure to answer all parts.

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!