Solutions of mercury (I) nitrate and potassium bromide are mixed

With that informatio you can:

1) Write the chemical equation

2) Balance the chemical equation

3) State the molar ratios

4) Predict if precipitation occurs.

I will do all four, for you:

1) Chemical equation:

mercury (I) nitrate potassium bromide mercury (I) bromide potassium nitrate

Hg2 (NO3) 2 + KBr → Hg2Br2 + KNO 3

2) Balanced chemical equation

Hg2 (NO3) 2 + 2KBr → Hg2Br2 + 2KNO 3

3) Molar ratios or proportions:

1 mol Hg2 (NO3) 2 : 2 mol KBr : 1 mol Hg2Br2 : 2 mol KNO 3

4) Prediction of precipitation.

You can use the solubility rules or a table of solubilities. I found in a table of solutiblities that mercury (I) bromide is insoluble and potassium bromide is soluble, Then you can predict that the precipitation of mercury (I) bromide will occur.