Q26 of 37 Page 22

If ten volumes of dihydrogen gas react with five volumes of dioxygen gas, how many volumes of water vapour would be produced?

The reaction of hydrogen with oxygen is given as below:

2H2 + O2→ 2H2O


By referring to above equation, 2 volumes of hydrogen and 1 volume of oxygen react together to form 2 volumes of water.


So if 10 volumes of hydrogen react with 5 volumes of oxygen then 10 volumes of water is produced.


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24

Dinitrogen and dihydrogen react with each other to produce ammonia according to the following chemical equation:


(i) Calculate the mass of ammonia produced if 2.00 × 103 g dinitrogen reacts with 1.00 ×103 g of dihydrogen.


(ii) Will any of the two reactants remain unreacted?


(iii) If yes, which one and what would be its mass?

25

How are 0.50 mol Na2CO3 and 0.50 M Na2CO3 different?

 27

Convert the following into basic units:

(i) 28.7 pm


(ii) 15.15 pm


(iii) 25365 mg

 28

Which one of the following will have largest number of atoms?

(i) 1 g Au (s)


(ii) 1 g Na (s)


(iii) 1 g Li (s)


(iv) 1 g of Cl2 (g)