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At the same temperature and pressure gas volumes are 9 litres 27 litres and 18 litres. What is the simplest ratio?

Answer and explanation

Correct answer: 1:3:2

The direct answer is C: 1:3:2. Put the volumes in the given order: 9:27:18. The greatest common divisor is 9. Divide each term by 9: 9 ÷ 9 = 1, 27 ÷ 9 = 3, and 18 ÷ 9 = 2. Therefore the simplest ratio is 1:3:2. Option A, 9:27:18, is correct as an equivalent ratio but not in simplest form. Option B, 2:3:1, gives a different order and different relationships. Option C is correct because it comes directly from common division. Option D, 1:2:3, would incorrectly make the second volume twice the first and the third three times the first; actually the second is three times the first and the third twice the first. The condition of equal temperature and pressure does not change the arithmetic. Memory cue: compare each volume with the first after dividing by the common factor.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11

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