Calculate the amount of (mol) of Rh in 1.69g of Rh. If the molar mass is 102.90?
You have 0.01642 moles of rhodium,
You know that
The exact number of moles of rhodium you have is
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.