Question

25.
The number of atoms in 20 g of So^3is approximately
(1) 1 x 10^23
(2) 1.5 x 10^23
(3) 2 x 10^23
(4) 6 x 10^23
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Answer 1

Answer:

Each moleucle of SO3 has 4 atoms. Moles present in 20 g of SO3 = 20/ 80.07 = 0.2498 mol. Number of molecules = 0.2498 X 6.022 X 1023 = 1.5 X 1023 molecules.