Q29 of 49 Page 22

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 × 102 4kg). Which one of the two is heavier and by how many times?

Mass of one steel screw = 4.11g

Mass of Earth = 5.98 × 1024kg = 5.98 × 1027kg


We know, 1 mole = 6.022 x 1023


One mole of screws weigh = 4.11 x 6.022 x 1023 = 2.48 ×1024g


Mass of the Earth/ Mass of 1 mole of screws = 5.98 ×1027 kg / 2.48 ×1024 kg = 2.4 x 103


Therefore, we can say that the mass of earth is 2.4×103 times the mass of screws.


The earth is 2400 times heavier than one mole of the screw.


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