What is the ratio of carbon atoms to hydrogen atoms in the compound 2CH2 --> C2H4?
A ratio is used in mathematics, usually given in the format x:y, where x and y are numbers. It defines the relationship between two quantities. Reading a ratio we usually say we have y for every x.
Answer and Explanation:
This compound is called ethene and is shown below.
There are 2 carbon atoms and 4 hydrogen atoms. For every 1 carbon atom, there are 2 hydrogen atoms. This gives us a ratio of 1:2 carbon to hydrogen atoms.
Going through the multiple-choice answers we need to find a ratio which equals 1:2. Answers A and B are obviously incorrect.
Answer C (3:6) when simplifying the ratio gives 1:2. This is therefore the correct answer.
Answer D (6:3) when simplifying the ratio gives 2:1 which is not the ratio we are looking for. This would be the ratio for hydrogen atoms to carbon atoms.
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Learn more about this topic:
from Geometry: High SchoolChapter 7 / Lesson 1