Question

Calculate the number of atom in 0.23 grams sodium

Answer 1

Answer:

6.022*10^21

Explanation:

we know

23 g of Na contains 6.022*10^23 atoms

so 1 g of Na contains 6.022 *10^23  /23 atoms

therefore 0.23 g of Na contains 6.022*10^23/23*0.23=6.022*10^21

[NOTE: just use unitary method and mole concept]