A biochemist who is studying the properties of certain sulfur (S)–containing compounds in the body wonders whether trace amounts of another nonmetallic element might have similar be- havior. To which element should she turn her attention? (a) O, (b) As, (c) Se, (d) Cr, (e) P.

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Q: A biochemist who is studying the properties of certain sulfur(S)–containing compounds in the body…

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Q: Question mentioned in attached file

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Q: why is that in Pb(CrO4)2, the charge of CrO4 is -2

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.