The number of chlorine atoms in 20 mL of chlorinc gas at STP is __________ `10^(21)`. (Round off to the Nearest Integer).
[Assume chlorine is an ideal gas at STP R=0.083 L bar `"mol"^(-1) K^(-1) N_(A) =6.023 xx 10^(23)`]

KBr is doped with 10^(-5) mole percent of SrBr_(2) . The number of cationic vacancies in 1 g of KBr crystal is ________ 10^(14) . (Round off to the Nearest Integer). [Atomic Mass : K : 39.1 u, Br : 79.9 u N_(A)=6.023 xx 10^(23) ]

The number of molecules present in 1.12xx10^(-7)c c of a gas at STP is

The mole fraction of a solution in a 100 molal aqueous solution is "_____________"xx 10^(-2) ( Round off to the Nearest Integer ). [ Given : Atomic masses : H : 1.0 u, O : 16.0 u]

Consider the reaction N_(2)O_(4)(g) hArr 2NO_(2)(g) . The temperature at which K_(C )=20.4 and K_(P)=600.1 , is _______ K. (Round off to the Nearest Integer). [Assume all gases are ideal and R = 0.0331 L bar K^(-1) "mol"^(-1) ]

The pressure exerted by a non-reactive gaseous mixture of 6.4g of methane and 8.8 g of carbon dioxide in a 10L vessel at 27^(@)C is "__________" kPa. ( Round off to the Nearest Integer ). [ Assume gases are ideal, R = 8.314] mol^(-1) K^(-1) Atomic masses : C : 120 u, H : 1.0 u, O : 16.0 u ]