Question

how many grams of neon will have the same number of atoms as 4 gram of Calcium atomic mass is Neon is equal to 20 and Calcium is equal to 40 u

Answer 1

Gram atomic mass of Ca = 40g
1 mole of Ca = 40g
no.of.mole in 4g Ca = 4\40
= 0.1mole

Now, as we know that same number mole of each element contain same number number of atom...

so, 0.1 mole of neon will have the same number of atom as 4g of Ca..
we have to convert 0.1 mole of neon into mass

so, no.of moles = Mass of element\Atomic mass of element

0.1 = mass of element \ 20
Mass of element = 20*0.1
Mass of element = 2g...