If a sample of copper is 3.3g, how many moles of copper atoms is there in the sample?

3.1 *10^22 atoms Cu

Explanation:

M(Cu) = 63.5 g/mol

3.3 g Cu * 1mol Cu/63.5 g Cu = 0.0520 mol Cu

0.0520 mol Cu * 6.02*10^23 atoms Cu/1 mol Cu = 3.1 *10^22 atoms Cu

the answer is b & c i believe : )

1.solid

2.carbon dioxide

3.helium