How many moles of atoms are in 3.61 g Ni?
Answer in units of mol

Let's start by answering this question: What's the mass 1mol of Ni?

You find it the same way you find the mass of 1 mol of any element, by looking up the atomic weight on the periodic table. By definition, that's the mass (in grams) of 1 mol of the element.

So what's the atomic weight of nickel? If that's the mass of 1 mol, then how many mols is 3.61g?

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