Chemistry Practice Problems Molecular Models Practice Problems Solution: The following diagramrepresents an ionic compound ...

Solution: The following diagramrepresents an ionic compound in which the red spheres (six spheres with vertical stripes in the middle row) represent cations and blue spheres (12 spheres with six in the top row and six in the bottom row) represent anions.Which of the following formulas is consistent with the drawing: KBr, K2SO4, Ca (NO3) 2, Fe2 (SO4) 3?

Problem

The following diagramThe figure shows 3 rows of spheres. There are 6 blue spheres in the top row, 6 red spheres in the middle row, and 6 blue spheres in the bottom row.represents an ionic compound in which the red spheres (six spheres with vertical stripes in the middle row) represent cations and blue spheres (12 spheres with six in the top row and six in the bottom row) represent anions.

Which of the following formulas is consistent with the drawing: KBr, K2SO4, Ca (NO3) 2, Fe2 (SO4) 3?

Solution

The red spheres represent cations and the blue spheres represent anions.

Now if we have 6 red spheres to 12 blues spheres this means that we can express the ratio of the cation to anions as 6:12. 

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