Question

How many number of potassium atoms are present in 7.8g of potassium element?

Answer 1

Number of grams atoms present in 39 gram=6.023 ×10 ^23

Number of grams atoms present in 1 gram =6.023 ×10^23 /39

Number of grams atoms present in 7.8 gram=6.023×10 ^23×7.8 /39

= 1.20 ×10 ^23

Answer 2

$\bf\huge\ Question:-$

How many number of potassium atoms are present in 7.8g of potassium element

$\bf\huge\ Answer:-$

your answer is 1.20 ×10²³