MediumChemistryHigh School (9–10)GeneralCarbon and Its Compounds › Covalent Bonding and AllotropesNumericalBoard Exam
A graphite rod of mass 18 g burns completely in oxygen…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A graphite rod of mass burns completely in oxygen. What mass of carbon dioxide is made? Would of diamond give a different mass? (, .)
Need a reminder? The key ideaShow
Allotropes are forms of one element. Diamond: each atom bonded to four others, very hard, no free electrons. Graphite: layers of hexagons, each atom bonded to three, soft and slippery, conducts. Fullerene : a cage of atoms. All burn to carbon dioxide: .
The worked solution
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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. Moles. of carbon.
Step 2. Carbon dioxide. .
Step 3. Diamond. Diamond is also pure carbon. of it holds the same number of atoms, so it gives the same .
Answer: of carbon dioxide, and no difference for diamond.
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