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Q.

How many sulphur and oxygen atoms are present in 0.25 mole of SO3?

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a

1.505 × 1023 sulphur atoms

b

4.515 × 1023 sulphur atoms

c

4.515 × 1023 oxygen atoms

d

1.505 × 1023 oxygen atoms

answer is A, C.

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Detailed Solution

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SO3 has 1 sulphur atom and 3 oxygen atoms in 1 molecule.
1 mole of any substance contains molecules = 6.022 × 1023 
Number of atoms of sulphur in 0.25 mole of SO30.25 × 6.022 × 1023                                                                                           1.505 × 1023 atoms

1.505 ×1023 sulphur atoms are present in 0.25 mole of SO3.

Number of atoms of oxygen in 0.25 mole of SO3 = 3 × 0.25 × 6.022 × 1023                                                                                                     4.515 × 1023 atoms
3 is taken because 1 molecule of SO3 contains 3 oxygen atoms.

Total number of atoms in 0.25 moles of SO3 = (1.505 + 4.515) × 10²³                                                                                                                                                         6.02 × 10²³
 

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How many sulphur and oxygen atoms are present in 0.25 mole of SO3?