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At the same temperature and pressure gas volumes are 13 litres 26 litres and 13 litres. What is the simplest ratio?

Answer and explanation

Correct answer: 1:2:1

The direct answer is A: 1:2:1. Start with the volumes in order: 13:26:13. Their greatest common divisor is 13. Dividing all terms by 13 gives 13 ÷ 13 = 1, 26 ÷ 13 = 2, and 13 ÷ 13 = 1. Therefore the simplest ratio is 1:2:1. Option A is correct and is already in lowest terms because 1, 2 and 1 have no common divisor greater than 1. Option B, 13:26:13, is the original unsimplified ratio. Option C, 1:2:3, incorrectly changes the third volume; the third is equal to the first, not three times it. Option D, 1:6:1, incorrectly changes the middle volume; it is twice the first, not six times it. Check by multiplying 1:2:1 by 13 to recover the original volumes. Memory cue: equal original values remain equal after simplification.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11

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