Question

which of the following is the balanced equation for the reaction between hydrogen gas (h2) and oxygen gas (o2) to produce water (h2o)? a) h2 + o2 -> h2o b) 2h2 + o2 -> 2h2o c) h2 + 2o2 -> 2h2o d) 2h2 + 2o2 -> 2h2o

Explanation:

Step1: Check hydrogen atoms

In option a, there are 2 hydrogen atoms on the left - hand side and 2 on the right - hand side. In option b, there are 4 hydrogen atoms on the left - hand side ($2\times2$) and 4 on the right - hand side ($2\times2$). In option c, there are 2 hydrogen atoms on the left - hand side and 4 on the right - hand side. In option d, there are 4 hydrogen atoms on the left - hand side and 4 on the right - hand side.

Step2: Check oxygen atoms

In option a, there are 2 oxygen atoms on the left - hand side and 1 on the right - hand side. In option b, there are 2 oxygen atoms on the left - hand side and 2 on the right - hand side. In option c, there are 4 oxygen atoms on the left - hand side and 2 on the right - hand side. In option d, there are 4 oxygen atoms on the left - hand side and 2 on the right - hand side.

Answer:

B. 2H2 + O2 -> 2H2O