Question

In an experiment the following reactions takes place:
$X+Y\to Z2g4gug$

$Z+A\to Bug7gcg$

What is the value of u and c respectively?

• A. 7, 4
• B. 4, 7
• C. 6, 13
• D. 13, 6

Answer 1

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,
$X+Y\to Z2g4gug$

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

Similarly for,
$Z+A\to Bug7gcg$

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