How many atoms of lithium are in 2.5 moles

1.50x10²⁴ atoms of Li are contained in 2.5 mol of it

Explanation:

NA (Avogadro's number) is the number of particles that occupy 1 mol, of anything. Let's do a rule of three:

1 mol of Li has 6.02x10²³ atoms

2.5 moles of Li have ( 2.5 .NA) /1 =1.50x10²⁴

3 1/4 %

explanation:

c, liquids evaporate, creating a gas