EasyChemistryHigh School (9–10)GeneralAtoms and Molecules › Laws of Chemical CombinationNumericalBoard Exam
36 g of magnesium burns completely in 24 g of oxygen…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
- of magnesium burns completely in of oxygen. Find the mass of the magnesium oxide made.
- What mass of oxygen joins with of magnesium?
Need a reminder? The key ideaShow
A compound always has its elements in the same ratio by mass: water , carbon dioxide , ammonia , magnesium oxide . To share a mass in a ratio, add the parts first. Any extra of one element is left over.
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. (a) of magnesium oxide.
Step 2. The ratio. .
Step 3. (b) of oxygen.
Answer: (a) . (b) .
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