Q30 of 49 Page 22

A sample of vitamin C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?

We know,

1 mole = 6.022 x 1023


The number of moles =



n = 4.28mol


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28

Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 225 g of pure HgS? Molar mass of Hg and S are

200.6 g mol–1 and 32 g mol–1 respectively.

 29

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?

 31

Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of the same weight. (a) Whose container is heavier? (b) Whose container has more number of atoms?

 32

Fill in the missing data in the Table 3.1