January 13, 2025, 09:35:09 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Precentage by Mass  (Read 3108 times)

0 Members and 2 Guests are viewing this topic.

Offline hullio

  • New Member
  • **
  • Posts: 6
  • Mole Snacks: +2/-0
Precentage by Mass
« on: April 24, 2007, 06:32:07 PM »
We're learning about moles, mole ratio, empirical, molecular formula stuff in class these days. I'm stuck on this question:

Calculate the percentage by mass of each element in Ammonium Sulphate (NH4)2SO4

Thank you. :)
Logged

Offline Bakegaku

  • Full Member
  • ****
  • Posts: 269
  • Mole Snacks: +20/-5
  • Gender: Male
  • Hydrogen peroxide is my miracle cure to everything
Re: Precentage by Mass
« Reply #1 on: April 24, 2007, 09:30:42 PM »
Show your attempts!  :)
Logged
"True knowledge exists in knowing that you know nothing"
-Socrates

"I see, I forget.  I hear, I remember.  I do, I understand"
-Confucius

"Nothing will benefit human health and increase chances for survival of life on Earth as much as the evolution to a vegetarian diet."
- Albert Einstein?

"American cartoons place characters in situations; anime
places situations around characters.  Anime characters
are not like fictional characters but more like fictional
people; their actions stem directly from their personalities,
and not just as a means to move the story's plot
forward.  We are made to sympathize with them, and
not simply be entertained by them."
~John Oppliger~

Offline syko sykes

  • Full Member
  • ****
  • Posts: 128
  • Mole Snacks: +12/-10
  • Gender: Male
Re: Precentage by Mass
« Reply #2 on: May 14, 2007, 08:31:17 PM »
use molar mass and divide part by whole

example: H2O

molar mass:
H: 1
O: 16
total: 1(2) + 16 = 18

% H = 1(2)/18 = 1/9 = .111 = 11.1%
% O = 16/18 = 8/9 = .889 = 88.9%
Total = 88.9 + 11.1 = 100% Yay!!!
Logged
AP Chemistry Squad Member [V]
Pages: [1]   Go Up
« previous next »
Sponsored Links