1.

Calculate the no. Of oxygen molecules in 12.8 g of SO2.

Answer»

Molecular weight of SO2 = 64 g/mol

∴ Number of moles of SO2 in 12.8 g = \(\frac{12.8}{64} \) = 0.2 mol

∵ 1 molecule of SO2 contains = 1 molecule of O2

∴ 0.2 moles of SO2 contains = 0.2 moles O2 molecule

∴ Number of O2 molecule in 12.8g SO2 = 0.2 x 6.022 x 1023 molecule

= 1.2 x 1023 molecules



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