Question

Question #eb96a

Answer 1

1.66g

Explanation:

Number of moles:
n(Cu) = 0.0261mol

Molar mass (from periodic table):
63.55g

n = `"m"/"M"`

Rearranged we get:
m = `n * M`
m = `0.0261 * 63.55`
m = 1.658655

And to three significant figures, the number posed in the question:

m = 1.66g