27 Which of the following pairs have same number of molecules i)2 g of O2, 4 g of SO2 - Chemistry - Some Basic Concepts of Chemistry

Question

27 Which of the following pairs have same number of molecules?
i)2 g of O2, 4 g of SO2
ii)2 g CO2, 2 g of N2O
iii)224 ml O2 at STP, 448 ml of He at 0 5 atm and 273
K
iv)2 g oxygen and 2 g ozone

Jainabbee Abid Shaikh · Accepted Answer

Dear student,

i) molar mass of O2 is 32 and that of SO2 is (32+16 x 2) = 64
therefore, 32 g of O2 and 64 g of SO4 has same moles
Thus, 2 g of O2 and 4 moles of SO2 has same number of moles

ii) Molar mass of CO2 is (12 + 16 x 2) = 44 and that of N2O is (14
x 2 +16) = 44
Therefore, 2 g of CO2 and N2O each has same number of moles

iii) Number of moles is directly proportional to the number of
moles
Therefore, same volume of gases will have same number of moles
Thus, the two gases have different volumes and hence different
number of moles

iv) Molar mass of O2 is 32 and that of O3 is 48
Thus same mass of the two gases cannot have same number of
moles

Regards

27.Which of the following pairs have same number of molecules? i)2 g of O2, 4 g of SO2 ii)2 g CO2, 2 g of N2O iii)224 ml O2 at STP, 448 ml of He at 0.5 atm and 273 K iv)2 g oxygen and 2 g ozone

27.Which of the following pairs have same number of molecules?
i)2 g of O₂, 4 g of SO₂
ii)2 g CO₂, 2 g of N₂O
iii)224 ml O₂ at STP, 448 ml of He at 0.5 atm and 273 K
iv)2 g oxygen and 2 g ozone