1.

67.2 L of Carbon dioxide gas is filled in a cylinder at STP. a. Calculate the mass of CO2  present in it. (Atomic mass- C = 12, O = 16) b. Calculate the number of molecules present in the cylinder.

Answer»

a. Molecular mass of CO2 =12 × 1+16 × 2 = 12 + 32 = 44

No. of moles in 67.2L CO2  at STP = \(\frac{67.2L}{22.4L}\) = 3

b. 3 × 6.022 × 1023



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