To figure out how many atoms of copper you get in 1 gram of copper, you need to use copper's molar mass.
An element's molar mass tells you what the mass of one mole of that element is.
Now, one mole of an element is defined as
In copper's case, you know that its molar mass is 63.546 g/mol.
This tells you that
#1color(red)(cancel(color(black)("g"))) * (6.022 * 10^(23)"atoms of Cu")/(63.546color(red)(cancel(color(black)("g")))) = color(green)(9.5 * 10^(21)"atoms of Cu")#
I'll leave the answer rounded to two sig figs, despite the fact that you only gave one sig fig for the mass of the copper sample.