Question

How to write a balanced molecular equation for double displacement reaction: ammonium chromate and aluminum bromide

a) 2NH4CrO4 + 3AlBr3 → 2(NH4)3Cr + 3Al(OH)3
b) (NH4)2CrO4 + 3AlBr3 → 2NH4Br + Al2(CrO4)3
c) 2(NH4)2CrO4 + 3AlBr3 → 6NH4Br + Al2(CrO4)3
d) (NH4)2CrO4 + AlBr3 → 2NH4Br + Al(CrO4)3

Answer 1

The balanced molecular equation for the double displacement reaction between ammonium chromate and aluminum bromide is (NH4)2CrO4 + 3AlBr3 → 2NH4Br + Al2(CrO4)3.

Step-by-step explanation:

In a double displacement reaction, the cations and anions swap to form new compounds. To write a balanced molecular equation for the double displacement reaction between ammonium chromate and aluminum bromide, we must ensure that the number of atoms on each side of the equation is equal, and that the charges are balanced. The correct balanced equation is b) (NH4)2CrO4 + 3AlBr3 → 2NH4Br + Al2(CrO4)3.