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Question

In an experiment the following reactions takes place:
X + Y Z2 g 4 g u g

Z + A Bu g 7 g c g

What is the value of u and c respectively?


A

7, 4

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B

4, 7

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C

6, 13

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D

13, 6

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Solution

The correct option is C

6, 13


According to the law of conservation of mass, the total mass of reactants is equal to the total mass of products.
For,
X + Y Z2 g 4 g u g

Mass of Z = Mass of X + Mass of Y
u = (2+4) g = 6 g

Similarly for,
Z + A Bu g 7 g c g

Mass of B = Mass of A + Mass of Z
c = (u+7) g = (6+7) g = 13 g.
Hence, the mass of Z= 6 g and mass of B = 13 g.


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