Friday
October 24, 2014

Homework Help: chemistry

Posted by dr bob's number one fan on Thursday, November 15, 2012 at 12:37am.

How to find moles given oxidation numbers and chemical formula?
Trying to do my chemistry lab but i'm super duper stuck. please help me i'm gonna die. this is the part i'm stuck on:

The overall charge on the complex, [Ni(en)(H2O)]^2+ * SO4^2- * H2O is zero; the charge on sulfate ion is 2-;en and water ligands both have a charge of zero; and nickel has a charge of 2+. Using this information and your previous experimental results, calculate the number of moles of SO4^2- in 100 grams of your complex and the mass percent of SO4^2- in your complex.


previous experimental results:
Molarity of Ni^2+ in unknown sample: 0.0647M
Moles of Ni^2+ in 100 g of complex: 0.475 moles
Mass % of Ni^2+ in complex: 27.86%

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Math - 3rd grade summer work - A Super-Duper ball bounces twice its height when ...
chemistry - I am trying to answer a bunch of lab questions about a lab I did and...
Chemistry - Since the oxidation number of Chromium is +3, and the oxidation ...
chemistry - hi Dr Bob..can you please help me with this chemistry problem? I got...
Chemistry - Sorry to post again but I'm really stuck on this one! I'm doing ...
Chemistry - I'm doing some post lab questions and I'm stuck on one. In lab we ...
Chemistry - Stuck on this because I haven't done chemistry in a while. Can ...
MOLARITY QUESTION - I am trying to answer a bunch of lab questions about a lab I...
reading - Please this is super duper important do you know where i can read the ...
Chemistry - what is the molecular formula of a compound that is 54.5% C, 9.09% H...

Search
Members