Question

The atomic mass of calcium is for 40u. what will be the number of calcium atoms in 0.4 of calcium?

Answer 1

one mole of calcium is equals to 40 gram and a one of calcium is equal to Avogadro number of atoms ,have a number of it that is 6.022 into 10 power 23 so 40 gram is equal to 6.022 into 10 power 23 then 1 gram is equal to 1 upon 6.02 to the power 23 upon 40 so 0.4 gram is equal to 6.022 into 10 power 23 into 0.4 upon 40 so the answer is 6.022 and 10 power 21

Answer 2

Answer:

Explanation:

Refer the below attachment.