52 What will be the volume of O gas at STP which is obtained by thermal decomposition of 30.62 g KClO , with 80% purity :- (1) 3.36 L (2) 6.72 L (3) 10.11 L (4) 1.68 L

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Q. What volume of

N H_{3} (g)

27^{o} C

and 1 atm pressure will be obtained by thermal decomposition of

26.25 g N H_{4} C l

Q. A sample of

{K C l O}_{3}

on decomposition yielded

448 m L

of oxygen gas at STP. then the weight of

{K C l O}_{3}

originally taken was:

(a) (i) What volume of oxygen is required to burn completely $90 d m^{3}$ of butane under similar conditions of temperature and pressure?

$2 C_{4} H_{10} + 13 O_{2} \to 8 C O_{2} + 10 H_{2} O$

(ii) the vapour density of a gas is 8. What would be the volume occupied by 24.0 g of the gas at STP?
(iii) A vessel contains X number of molecules of hydrogen gas at a certain temperature and pressure. How many molecules of nitrogen gas would be present in the same vessel under the same conditions of temperature and pressure?

(b) $O_{2}$ is evolved by heating $K C l O_{3}$ using $M n O_{2}$ as a catalyst.

$2 K C l O_{3} M n O_{2} - --- \to 2 K C l + 3 O_{2}$

(i) Calculate the mass of $K C l O_{3}$ required to produce 6.72 litres of $O_{2}$ at STP.
[atomic masses of $K = 39, C l = 35.5, O = 16]$
(ii) Calculate the number of moles of oxygen present in the above volume and also the number of molecules.
(iii) Calculate the volume occupied by 0.01 mole of $C o_{2}$ at STP.

Q. Calcium carbonate decomposes on heating according to the equation;

C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

At STP, the volume of

C O_{2}

obtained by thermal decomposition of 50 g of

C a C O_{3}

will be:

Q. Calcium carbonate decomposes on heating according to the equation

C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

The volume of

C O_{2}

obtained by thermal decomposition of 50 g of

C a C O_{3}

at STP will be:

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