1. What are the molar concentrations of iron (Fe) and of sulfate (SO4) in a solu

Question

1. What are the molar concentrations of iron (Fe) and of sulfate (SO4) in a solution of 0.450M Fe2(SO4)3? (answer = 0.9M Fe, 1.35M SO4)

2. A car’s antifreeze mixture is made by mixing equal volumes of ethylene glycol (d = 1.114 g/mL, molar mass 62.07 g/mol) and water (d = 1.000 g/mL) at 20.0 °C. The density of the solution is 1.070 g/mL. Express the concentration of ethylene glycol as:

(a) volume percent (answer = 50%)

(b) mass percent (answer = 52.7%)

(c) molarity (answer = 8.97M)

Please explain! I want to understand how to solve, thank you!

Explanation / Answer

1. The equilibrium reaction is Fe2 (SO4)3 ----> 2 Fe3+ + 3 (SO4)2-

The concentration of Fe2(SO4)3 is M = 0.450M

So, the concentration of Fe will be MFe = 2 x M = 2 x 0.450 = 0.900 M

So, the concentration of SO4 will be MSO4 = 3 x M = 3 x 0.450 = 1.350 M

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