Calculate the amount of (mol) of Rh in 1.69g of Rh. If the molar mass is 102.90?

1 Answer
Stefan V.
Feb 27, 2015

You have 0.01642 moles of rhodium, "Rh", in "1.69 g" of "Rh".

You know that "Rh"'s molar mass is "102.90 g/mol". What that means is that 1 mole of rhodium weighs "102. 9 g". If you compare that to 1.69 g, the mass given to you, it'll be obvious that you have less than 1 mole.

The exact number of moles of rhodium you have is

"1.69 g Rh" * "1 mole"/"102.9 g" = "0.01642 moles Rh"

Remember, molar mass expresses the weight of 1 mole of an element or substance; in this case, less than 102.9 g of rhodium will mean less than 1 mole, and more than 102.9 g will mean more than 1 mole.

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