Saturday
August 30, 2014

Homework Help: General Chemistry

Posted by Dave on Tuesday, October 12, 2010 at 1:26am.

A student dissolved 4.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are there in the final solution?

0.0197 g

0.0394 g

0.0542 g

0.108 g


Don't understand it. I keep getting 0.394 g as my final result.
1. (0.218639 M)(0.00400 L) = (x M)(0.275 L)
= 0.00318 M Co(NO3)2
2. 0.00318 M Co(NO3)2 x 2 mol NO3- / 1 mol Co(NO3)2 x 62 g NO3- / 1 mol NO3- = 0.394 g NO3-

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chemistry - Hey, I am having a real hard time getting the answers to the ...
Chemistry - A student dissolves 18.9 grams of Zn(NO3)2 [molar mass = 189] in ...
Chemistry - A student dissolves 18.9 grams of Zn(NO3)2 [molar mass = 189] in ...
chemistry - A student needs to make a dilution from a stock solution. The stock ...
Chemistry - The molecular mass of glucose is 180g/mol. you prepare a stock ...
Chem II - A solution is prepared by dissolving 12.7 g Ca(NO3)2 in enough water ...
chem - A student based the analysis of Cu(II) in a sample on the formation of ...
Chemistry (reposts#2) - A solution is prepared by dissolving 5.00 g of ferric ...
Chemistry(reposts #1) - A solution is prepared by dissolving 5.00 g of stannic ...
chemistry - A solution is prepared by dissolving 25.0 g of ammonium sulfate in ...

Search
Members