Question

1. Compared to phosphorus, the elctron affinity of silicon is ?

A) the same

B) smaller

C) greater

D) impossible to tell

2. In the reaction 2Al + 3Br2 ______ 2AlBr3 . If you start with 6.0 moles of Br2 and excess Al, and the actual yield of AlBr3 is 3.0 moles . The % yield is ?

A) 50%

B) 67%

C) 75%

D) 90%

3. The [Br-] in 0.30 M AlBr3 is

A) 0.30 M

B) 0.90 M

C) 0.10 M

D) cannot determined