1. Compared to phosphorus, the elctron affinity of silicon is ? A) the same B) s

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
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

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

Explanation / Answer

1)

P > Si; from the trend on chart (increases to the right)

2)

%yield = real/theoretical * 100

real = 3

theoretical = 4

then

% = 3/4 * 100 = 75%

3)

there is 3 Br ions per 1 mol of AlBr3 then

0.3*3 = 0.9 will be Br- concnetration

choose B

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