What volume of air at 1 atm and `273K` containing `21%` of oxygen by volume is required to completely burn sulphur `(S_8)` present in `200g` of sample , which contains `20%` inert material which does not burn. Sulphur burns according to the reaction `1/8 S_8(s)+O_2(g)rarrSO_2(g)`

2.8 g of a gas at 1atm and 273K occupies a volume of 2.24 litres. The gas can not be:

What volume of HNO_3 (sq.gravity 1.05 gmL^(-1) containing 12.6(w/W) of HNO_3 ) that reduce into NO is required to oxidise iron g FeSO_4. 7H_2O in acid medium is :

A given volume of ozonised oxygen (containing 60% oxygen by volume ) required 220 sec to effuse while an equal volume of oxygen took 200 sec only under identical conditions. If density of O_(2) is 1.6 g/L then find density of O_(3) .

Calculate the number of millilitre of NH_3 (aq) solution (d=0.986 g/mL) contain 2.5% by mass NH_3 , which will be required to precipitate iron as Fe(OH)_3 in a 0.8g sample that contains 50% Fe_2O_3 .

How many molecules of O2 are present in 1L air containing 80% volume of O2 at STP?

What volume of HCI solution of density 1.2g/cm^3 and containing 36.5% by mass HCI , must be allowed to react wtih zinc (Zn) in order to liberate 4.0 g of hydrogen ?

A mixture of NH_(3(g)) and N_(2)H_(4_((g))) is placed in a sealed container at 300 K . The total pressure is 0.5 atm . The container is heated to 1200 K , at which time both substances decompose completely according to the equations: 2NH_(3(g))rarrN_(2(g))+3H_(2(g)) N_(2)H_(4_((g)))rarrN_(2(g))+2H_(2(g)) After decomposition is complete, the total pressure at 1200 K is found to be 4.5 atm . Find the amount (mole) per cent of N_(2)H_(4(g)) in the original mixture.

During the discharge of a lead storage battery, the density of sulphuric acid fell down from 1.294 to 1.139 g/ml. Sulphuric acid of density 1.294g/ml is 39% H_2SO_4 by weight and that of density of 1.139 g/ml is 20% H_2SO_4 by weight. The battery holds 3.5 L of acid and the volume remains practically constant during discharge. calculate the number of ampere hours for which the battery must have been used. The charging and discharging reactions are: Pb^(2+)+SO_4^(2-)LeftrightarrowPbSO_4+2bare(Charging) PbO_2+4H^(+)+SO_4^(2-)+2bareLeftrightarrowPbSO_4+2H2O(Discharging) .

A definite amount of solid NH_(4)HS is placed in a flask already containing ammonia gas at a certain temperature and 0.1 atm pressure. NH_(4)HS decompses to give NH_(3) and H_(2)S and at equilibrium total pressure in flask is 1.1 atm. If the equilibrium constant K_(P) for the reaction NH_(4)HS(s) iff NH_(3)(g)+H_(2)S(g) is represented as zxx10^(-1) then find the value of z.

Calculate the formality of sodim thiosulphate (Na_2S_2O_3.5H_2O) solution, 1.24 g of which are dissolved in 100cm^3 of the solution.