Question

What are the number of gram atoms in 63.5 g of copper

Answer 1

n = m / M

M (Cu) = 63.5460 g/mol

n (Cu) = 63.5/63.5 = 1 mol

1 mol of matter contains 6.022×10²³ elementary entities of the substance.

63.5 g copper = 6.023×10²³ atoms of copper.