Question

Calculate the number of moles in 5.6liter of oxygen at N.T.P

Answer 1

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at STP 1 mole gas has volume of 22.4
liter so 5.6 liter CO2 is 5.6/22.4 = 0.25
mole CO2
This contains 2 x 0.25 = 0.5 mole
oxygen atoms
Now 3 mole O atoms are contained in 1
mole SO3 or
1 mole O atoms in 1/3 mole SO3 so 0.5
mole O atoms in 0.5/3 = 0.17 mole SO3
S is 32; O is 16 so 1 mole SO3 is 80
gram
Answer 0.17 x 80 = 13.6 gram SO3

Answer 2

number of moles is equals to who given amount of volume divided by 22.4 litres

5.6/22.4=0.25 moles or 1/4 moles