What is the mass in grams of 0.0489 mol cobalt?
There are 2.88 g of Co in 0.0489 mol of Co.
In order to convert moles of cobalt into grams of cobalt, we have to use the following conversion factor:
For dimensional analysis problems such as this, you always want to make sure the units that you don't need anymore cancel out. If you keep that idea in mind you should always end up with the correct value and units!
I must also add that cobalt (Co) has a molar mass of 58.93 g/mol.
To solve we just do this: