Which of the following is a formula for the compound iridium(III)bromide tetrahydrate?

Question

Quizplus · Accepted Answer

The compound contains iridium(III) and bromide ions, which are represented by the symbols Ir and Br, respectively. The tetrahydrate part indicates that there are 4 water molecules associated with the compound. Therefore, the correct formula is IrBr3•4H2O. To indicate this in the standard formula format, the subscript 3 is added to the Br to represent the three bromide ions, and the coefficient 4 is added to the H2O to indicate the four water molecules. Therefore, the correct formula is IrBr3•4H2O, which is represented in choice C.

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