Question

Calculate the mass of 2.8 litres of CO2 at S.T.P [C=12,O=16]​

Answer 1

Answer:

moles of CO2 at stp=2.8 l/22.4=0.125

moles=mass of CO2 /molar mass =mass/44

and mass of CO2 /44=0.125

so,mass= 0.125×44=5.5 g

Answer 2

Answer:

Explanation:

Molecular mass of CO2 = C + 2 (O) = 12 + 2 (16) = 44g mol

s.t.p 22.4 litres of CO2 has mass = 44g

∴ 2.8 lits. of CO2 has mass

44*2.8/12.4 = 44/8

=11/2

=5.5g

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