1.
For the following equilibria:

Ag++NH3⇌[Ag(NH3)]+\text{Ag}^+ + \text{NH}_3 \rightleftharpoons [\text{Ag}(\text{NH}_3)]^+; k1=3.5×10−3k_1 = 3.5 \times 10^{-3}

[Ag(NH3)]++NH3⇌[Ag(NH3)2]+[\text{Ag}(\text{NH}_3)]^+ + \text{NH}_3 \rightleftharpoons [\text{Ag}(\text{NH}_3)_2]^+; k2=1.7×10−3k_2 = 1.7 \times 10^{-3}

The formation constant of [Ag(NH3)2]+[\text{Ag}(\text{NH}_3)_2]^+ is