Asolution containing 2.8 moles of magnesium bromide is combined with a solution containing excess potassium carbonate. this chemical reaction takes place: mgbr2(aq) + k2co3(aq) → mgco3(s) + 2kbr(aq). if the volume of the resulting solution is 1.33 liters, what’s the concentration of potassium bromide? use the periodic table. a. 0.24 m b. 2.1 m c. 3.7 m d. 4.2 m e. 5.6 m

The concentration  of potassium  bromide (KBr)  is  4.2M (answer D)

  calculation

MgBr₂ (aq) +k₂co₃(aq) → MgCO₃(s)  + 2 KBr (aq)

Step  1: use the mole  ratio to determine the  moles of KBr

From equation above  MgBr₂ : KBr  is 1:2  therefore  the moles of KBr  is

=2.8 moles x 2/1 = 5.6 moles

Step 2: find the concentration  of KBr (malarity)

molarity = moles / volume in liters

= 5.6  moles / 1.33 L= 4.2 M ( answer D)

Letter D. 4.2 M

Explanation:

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