Equation II is the correct way to write the balanced equation because it follows the principle of balancing chemical equations using the smallest whole numbers.
Balancing reaction equation
Because Equation II adheres to the rule of balancing chemical equations using the smallest whole numbers, it is the proper approach to construct the balanced equation.
The coefficients in Equation I are twice as high as necessary, despite the fact that the number of atoms of each element on both sides is the same (fulfilling the law of conservation of mass). However, Equation II employs the fewest whole integers as coefficients while still depicting the same balanced chemical reaction.
Missing parts;
Both equation I and II are balanced, but equation II is the correct way to write the balanced equation. Why do you think this is? (Hint: Think fractions.)
I) 2 SnO2 + 4 H2 → 2 Sn + 4 H2O
II) SnO2 + 2 H2 → Sn + 2 H2O