Q22 of 37 Page 22

If the speed of light is 3.0 × 108 m s–1, calculate the distance covered by light in 2.00 ns.

Given:

Speed of light = 3.0 × 108 m s–1


Time in which distance is to be covered = 2.00 ns


Speed = [Distance]/ Time


Distance = [3.0 × 108] × [2×10-9]


= 0.6 m


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21

The following data are obtained when dinitrogen and dioxygen react together to form different compounds:


(a) Which law of chemical combination is obeyed by the above experimental data?


Give its statement.

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Fill in the blanks in the following conversions:

(i) 1 km = ...................... mm = ...................... pm


(ii) 1 mg = ...................... kg = ...................... ng


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In a reaction


Identify the limiting reagent, if any, in the following reaction mixtures.


(i) 300 atoms of A + 200 molecules of B


(ii) 2 mol A + 3 mol B


(iii) 100 atoms of A + 100 molecules of B


(iv) 5 mol A + 2.5 mol B


(v) 2.5 mol A + 5 mol B

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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?