Synthesis and Analysis of a Transition Metal Complex

I need help with my lab. Here are the questions.

What is the Calculation of % yeild of hexaamminenickel (II) Chloride?
use 7 grams of NiCl26H2O and its mass is 237.71. I got 6.83g but what is its % yeild?

It asked to estimate the amount of hexaaminenickel chloride that is neutralized by 25 ml of 0.10 M HCL and I got 97mg.

The mass I started with Ni(NH3)6Cl2 for trail 1 and trail 2 are both 100 mg. The molarity std HCl for both trail is .1M and the vol I titrated for Trail 1 is 26.8 ml and Trail 2 is 25.8 ml from the buret. From the given information, please answer:

(a) the moles of HCl used for both trail
(b) the moles of NH3 in product for both trail
(c) the mass of NH3 in product for both trail
(d) the % NH3 in product for both trial
(e) the theoretical calculation based on Ni(NH3)6Cl2 for % NH3 and experimentally found by analysis for % NH3

Please show step by step solution, so thatI may understand what you did. I have two other titration calculation that I need to solve and hopefully this will help. Thank you.