Question

complete the equation and balance it :

a) Zn + HCl → _ + _

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Answer 1

Answer:

Zn + HCl = ZnCl2 + H2

Explanation:

Balancing the equation

= Zn + 2HCl = ZnCl2 + H2

.....

Answer 2

The complete equation is :-

Zn + HCl → ZnCl₂ + H₂

_____________________________

Now, we have to balance the above equation!

Firstly, let's rewrite the above equation by using letter variables for coefficients :-

aZn + bHCl → cZnCl₂ + dH₂

Now, let's put up some series of equations, one for each element:-

=> Zn : a = c

=> H : b = 2d

=> Cl : b = 2c

Let , b = 1

Then, d = 1/2 , c = 1/2 , a = 1/2

Finally, let's put the value of the variables in the equation and solve it :-

=> 1/2Zn + HCl → 1/2ZnCl₂ → 1/2H₂

=> 2(1/2Zn + HCl) → 2(1/2ZnCl₂ + 1/2H₂)

=> Zn + 2HCl → ZnCl₂ + H₂

Hence, it has got balanced !