Question

The mass of one steel screw is 4.11g. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth (5.98 × 10²⁴kg). Which one of the two is heavier and by how many times?

Answer 1

Mass of 21 screw = 4.11 g

Mass of 1 mole of screws = 4.11 × 6.022 × 10²³ 

= 2.475 × 10²⁴ g

= 2.475 × 10²¹ kg

${\displaystyle \frac{\text{Mass of earth}}{\text{Mass of 1 mole screws}}=\frac{5.98\times {10}^{24}\text{kg}}{2.475\times {10}^{21}\text{kg}}}$

= 2416

It shows that mass of earth is 2416 times more than the mass of one mole of screws.