The number of atoms in 2 moles of aluminium is if the 1mole is 6.022*10 the power of 23 or 10^23

1.204 × 10²⁴ atoms

Explanation:

According to this question, one mole of aluminum (Al) atom contains 6.02 × 10²³ atoms.

If two moles of aluminum are given, this means that there will be 2 × 6.02 × 10²³ atoms of aluminum

2 × 6.02 × 10²3

= 12.04 × 10²³

= 1.204 × 10²⁴ atoms.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.