Unit Test

Question 3 • IA-Chemistry A Survey of Chemistry A

There are two magnesium ions for every two sulfide ions in magnesium sulfide. The ratio of Mg to S in the formula unit is .

Answer

1:1

2:2

1:2

Explanation

The given ratio is 2 magnesium ions to 2 sulfide ions. Divide both numbers by 2 to simplify: 2:2 = 1:1. Therefore, the ratio of Mg to S is 1:1, choice A.

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