Text only | Text with Images

ChemTopper Free Chemistry Help

Chemistry Homework Help => AP Chemistry => Topic started by: Harini on October 09, 2022, 02:08:08 PM

Title: Percent composition
Post by: Harini on October 09, 2022, 02:08:08 PM
I need help approaching these types of problems
[attachment id=0 msg=3430]
Title: Re: Percent composition
Post by: chenbeier on October 09, 2022, 08:14:31 PM
With consumed permanganate solution and it's molarity you get the moles of it. The ratio permanganate /iron is 1:5  so the moles of iron are 5 times higher. Calculate the mass by using the molar mass of iron.
The devide through the mass of sample times 100 gives the percentage .
Title: Re: Percent composition
Post by: uma on October 10, 2022, 11:20:57 AM
Quote from: Harini on October 09, 2022, 02:08:08 PM
I need help approaching these types of problems
[attachment id=0 msg=3430]
Molarity and volume of KMnO4 is given and the balanced equation is also given.
Molarity = moles /volume in L
Use this equation to know the moles of KMnO4
Follow these steps
Mx V (L) moles KMnO4   ----> Moles of Fe 2+ ------ grams of Fe
% of Fe in 5.00 g sample Hb = grams of Fe/ 5   * 100%
Text only | Text with Images