The anwer is 2 (C2H6) + 7(O2) =4 (CO2) + 6 ( H2O)
left side :
C=4 , H= 12, O=14
right side :
C=4 , H= 12, O=14
so they are balanced.
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Cl2(g) + 2KI --> 2KCl(aq) + I2(s)
The equation given is correctly balanced, because it contains the same numbers of each kind of atoms in the reactants as in the products.
A quadratic equation.
That's the equation.
That word "equals" in there makes it an equation.