Question

1 mole of any gas at STP has a volume of 22.4L

a)How many moles are present in 112L of SO2 gas at STP?

b)How many molecules are present in this much amount of SO2?

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Answer 1

ANSWER

a) 1 mole of any gas at STP has volume =22.4 L

Here, volume =11.2 L

⟹1 mole=22.4 L

⟹ 1/22.4 = 1 L

⟹11.2 L= 11.2/22.4 =0.5 moles

One molecule of SO2 is made up of 3 atoms.

∴ No.of atoms =3×0.5×NA

=1.5×NA

b) Our starting point is the fact that 1 mol of ANY substance contains 6.022 x 1023 particles. Thus 1 mol of SO2 will contain 6.022 x 1023 molecules of SO2.

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Answer 2

ANSWER

a) 1 mole of any gas at STP has volume =22.4 L

Here, volume =11.2 L

⟹1 mole=22.4 L

⟹ 1/22.4 = 1 lol

⟹11.2 L= 11.2/22.4 =0.5 moles

One molecule of SO2 is made up of 3 atoms.

∴ No.of atoms =3×0.5×NA

=1.5×NA

b) Our starting point is the fact that 1 mol of ANY substance contains 6.022 x 1023 particles. Thus 1 mol of SO2 will contain 6.022 x 1023 molecules of SO2.