Which of these will contain avogadro number of molecules:

Question

1)22.4dm3 of co2 at 27∘c and 1atm contain
2)44g of at 27∘c and 1 atm
3)2.7dm3 of co2 at 546k and 2atm
4)11.2l of co2 at 273 and 2atm

Answer 1

start by recalling that 1 mole occupies 22.4L (dm^3) at STP

Then use the fact that

PV=kT

since all the items are given in the same units, the formula works just fine. Just find the one which matches the standard values.

Answer 2

1 mol contains Avogadro's number. So use PV = nRT and calculate which is 1 mol.