4·The molecular weight of O2 and SO2 are 321and 64 respectively. At 1

1.	4·The molecular weight of O2 and SO2 are 321and 64 respectively. At 15°C and 150 mmHgpressure, IL of 02 contains 'N' molecules. Thenumber of molecules in 2L of SO2 under thesame conditions of temperature and pressure willbe(A) N/2(C) 2N[AIPMT 1990](B) N(D) 4N
Answer» From ideal gas eqn. PV = nRT, moles for O2 => PV/RT => 11/RT no. of molecules, N = Na/RT............(1) SIMILARLY FOR SO2, moles of SO2 => PV/RT => 12/RT no. of molecules, M = 2Na/RT........(2) divide both the eqns. we get, N/M = ½ M = 2N

4·The molecular weight of O2 and SO2 are 321and 64 respectively. At 15°C and 150 mmHgpressure, IL of 02 contains 'N' molecules. Thenumber of molecules in 2L of SO2 under thesame conditions of temperature and pressure willbe(A) N/2(C) 2N[AIPMT 1990](B) N(D) 4N

Answer»

From ideal gas eqn. PV = nRT,

moles for O2 => PV/RT => 1*1/RT

no. of molecules,

N = Na/RT............(1)

SIMILARLY FOR SO2,

moles of SO2 => PV/RT => 1*2/RT

no. of molecules,

M = 2Na/RT........(2)

divide both the eqns. we get,

N/M = ½

M = 2N