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The balanced equation :

2HCl + Zn ⇒ ZnCl₂ + H₂

Given

Reaction(unbalanced)

HCl + Zn ⇒ ZnCl₂ + H₂

Required

Balanced equation

Solution

Give a cofficient(the most complex compound=1)

aHCl + bZn ⇒ ZnCl₂ + cH₂

Make an equation

Zn, left = b, right = 1⇒b=1

Cl, left = a, right = 2⇒a=2

H, left = a, right = 2c⇒2c=a⇒2c=2⇒c=1

The equation becomes :

2HCl + Zn ⇒ ZnCl₂ + H₂

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.