67.2 L of CO₂ is filled in a cylinder at STP
a) Calculate the mass of CO₂ present in it
(at.mass of C: 12,0:16)
b) Calculate the no. of CO₂ molecules present in the cylinder
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Answer:
a) Molecular mass of CO
2
=12×1+16×2=12+32=44
No. of moles in 67.2 L CO
2
at STP=
22.4 L
67.2 L
=3
b) the number of molecules present in the cylinder is 3×6.022×1023 = 9.066×1023
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