A chemist weighed out 3.89 g of nickel. What is the number of moles of nickel she weighed out?

1 Answer
Apr 17, 2016

She measured out 0.0663 mol of nickel.


For this question, we need to use the Periodic Table to find the molar mass of #"Ni"# (58.69 g/mol).

The formula for molar mass is

#color(blue)(|bar(ul(color(white)(a/a) "molar mass" = "mass"/"moles"color(white)(a/a)|)))" "#

We can rearrange the formula to read

#"moles" = "mass"/"molar mass"#

#"moles" = 3.89 color(red)(cancel(color(black)("g Ni"))) × "1 mol Ni"/(58.69 color(red)(cancel(color(black)("g Ni")))) = "0.0663 mol Ni"#