SAT Subject Test Chemistry,10 edition

The following   reaction    should  be  used    to  answer  questions   9–11.

Ag(NH 3 ) 2 + → Ag+ +   2NH 3

7 . 27.0    g   of  silver  was reacted with    excess  sulfur, according   to  the following   equation:

2Ag +   S   →   Ag 2 S

25.0    g   of  silver  sulfide was collected.  What    are the theoretical yield,  actual  yield,  and

percent yield?

8 . What    is  the mass    in  grams   of  a   single  chlorine    atom?   Of  a   single  molecule    of  O 2?

9 . How many    moles   of  Ag  are required    for the production  of  11  moles   of  ammonia (NH 3 )?

    moles

10 . If 5.8 g of Ag(NH 3 ) 2 + yields 1.4 g of ammonia, how many moles of silver are produced?

(A) 4.4

(B) 5.8

(C) 0.041

(D) 0.054

(E) 7.2

11 . What are the percent compositions of Ag, N, and H in Ag(NH 3 ) 2 +?