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

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

the answer to this question is 3.