Balance the equation below: H2 + O2 ------------ H2O

Chemistry

1 answer:

Andreas93 [3]4 years ago

6 0

Answer: 2 H₂ + O₂ → 2 H₂O

Reasoning:

When balancing an equation, what you are trying to do is to ensure that the amount of each atom on the right side (reactant side), is equal to the amount of each atom on the left side (product side), because of the law of conservation of energy.

∴ the balanced equation is  2 H₂ + O₂ → 2 H₂O

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0.436 ⇒ 0.44

9.000 ⇒ 9.0

Concept:

Significant figures are where each of the digits of a number are used to express it to the required degree of accuracy, starting from the first nonzero digit.

Therefore, in the context of this question, two significant figure means that two digits of numbers are kept, from left to right, starting from the first nonzero digit.

Solve:

<h2>PART I: Rounding 0.436</h2>

0.436 has 3 significant digits in total starting from left to right

Thus, the last digit should be rounded up / down

Since the last digit is 6, it is greater than 5, so it should be rounded up.

Therefore, a rounded 0.436 is $\Large\boxed{0.44}$