Red-hot iron reacts with steam: Fe + H₂O → Fe₃O₄ + H₂.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Red-hot iron reacts with steam: .
- Balance the equation, and show by counting that it is balanced.
- How many molecules of steam react with atoms of iron?
Need a reminder? The key ideaShow
Balance an equation by changing only the numbers in front of the formulae, never a formula itself. Count each element on both sides. Start with an element in few formulae, keep a group such as together, and leave hydrogen and oxygen for last.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Iron. on the right, so .
Step 2. Oxygen. on the right, so .
Step 3. Hydrogen. Now on the left, so on the right: .
Step 4. Count. Fe , H , O .
Step 5. (b) iron atoms take steam molecules, so take .
Answer: (a) . (b) molecules of steam.
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