Part A In this reaction, what is the correct coefficient for hydrogen gas? \[ ? \mathrm{H}_{2}+? \mathrm{O}_{2} \rightarrow ? \mathrm{H}_{2} \mathrm{O} \] 1 2 3 4 5 Submit Request Answer

To balance the reaction \(\mathrm{H}_{2} + \mathrm{O}_{2} \rightarrow \mathrm{H}_{2} \mathrm{O}\), we start by noting that each water molecule contains 2 hydrogen atoms and 1 oxygen atom. Therefore, we need 2 \( \mathrm{H}_{2} \) to provide the 4 hydrogen atoms required for 2 water molecules, leading to: \[ 2 \mathrm{H}_{2} + 1 \mathrm{O}_{2} \rightarrow 2 \mathrm{H}_{2} \mathrm{O} \] So, the correct coefficient for hydrogen gas is **2**! Now, did you know that balancing chemical equations is not just a brain teaser? It’s like a puzzle that scientists have to solve to understand how chemicals interact in real life, from creating medicines to fueling rockets! Balancing ensures that the law of conservation of mass is upheld, meaning nothing is lost or made out of thin air in reactions. As for common mistakes, many people often forget to check that all atoms balance out, mistakenly adding coefficients without verifying their effects on both sides of the equation. It’s crucial to approach it step-by-step and always double-check your counts!