56:15 Minerals come from organic materials,
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Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

What is the lowest number energy level where a d sublevel is found