Question

Calculate the no. of atoms in 40g of aluminium

Answer 1

Answer:

Notice that the value 12.01 grams of natural carbon is the same as the atomic mass value (12.01 amu). It also tells us that 26.98 grams of aluminum contains exactly 6.022 x 1023 atoms of aluminum.

Answer 2

Answer:

the value 12.01 grams of natural carbon is the same as the atomic mass value (12.01 amu). It also tells us that 26.98 grams of aluminum contains exactly 6.022 x 10^23 atoms of aluminum.

so, no of atom in 40g of aluminium=40×6.022×10^23=240.88×10^23=2.41×10^25