• Wrong document? Swap it for free
  • Written by students who passed
  • Immediately available after payment
  • Read online or as PDF
  • 4.6 TrustPilot
0
Sell
Where do you study
Your language
Start selling Create your account
  • 5
  • Chemistry
To add items to your wishlist, you must be logged in
Document preview thumbnail
Preview 1 out of 3 pages
Exam (elaborations)

Chemistry

0.0
(0 reviews)
- sold
3 pages
2021/2022 Written for academic year
Institution
5
Course
Chemistry
Document preview thumbnail
Preview 1 out of 3 pages

A practice exam about percent composition and molecular and empirical formula.

Content preview

Percent Composition, Empirical and Molecular Formula



1. Turquiose has the following formula : CuAl 6(PO4)4(OH)8 .4H2O . Calculate the mass percent of each
element in turquoise.
Cu = 1 x 64 = 64 % Cu = 64/ 814 x 100 % = 7.9 %

Al = 6 x 27 = 162 % Al = 162/814 x 100 % = 19.9 %

P = 4 X 31 = 124 % P = 124 /814 x 100 % = 15.2%

O = 28 X 16 = 448 % O = 448/814 x 100 % = 55.0 %

H = 16 X 1 = 16 % H = 16/814 x 100 % = 2.0 %

814 100 %

2. Diazepam is the addictive tranquilizer also known as Valium. Its simplest formula is C 16H13N2OCl.
Calculate the mass percent of each element in this compound.


C = 16 X 12 = 192 % C = 192/284.5 X 100% = 67.5 %

H = 13 X 1 = 13 % H = 13/284.5 X 100% = 4 .6 %

N = 2 X 14 = 28 % N = 28/284.5 X 100% = 9.8 %

O = 1 X 16 = 16 % O = 16/284.5 X 100% = 5.6 %

Cl = 1 x 35.5 = 35.5 % Cl = 35.5/284.5 X 100% = 12.5 %

284.5 100%

3. A tablet of Tylenol has a mass of 0.611 g. It contains 251 mg of this active ingredient ,

acetaminophen C8H9NO2
a. What is the mass percent of acetaminophen in a tablet of Tylenol?
0.251 𝑔
x 100% = 41.1 %
0.611 𝑔




b. Assume that all the nitrogen in the tablet is in the acetaminophen . How many grams of nitrogen
are present in the tablet Tylenol?
C8H9NO2

Document information

School year
1
Uploaded on
October 19, 2021
Number of pages
3
Written in
2021/2022
Type
Exam (elaborations)
Contains
Questions & answers
Report Copyright Violation
$7.99
Wrong document? Swap it for free Within 14 days of purchase and before downloading, you can choose a different document. You can simply spend the amount again.
Written by students who passed
Immediately available after payment
Read online or as PDF
Seller avatar
jerrylynllena
Sold
0
Followers
0
Items
1
Last sold
-

Browse related subjects

Subjects

  • chemistry
  • solution
  • organic chemistry
  • percent composition
  • molecular formula
  • periodic elements
  • mass

Why students choose Stuvia

Created by fellow students, verified by reviews

Quality you can trust: written by students who passed their tests and reviewed by others who've used these notes.

Didn't get what you expected? Choose another document

No worries! You can instantly pick a different document that better fits what you're looking for.

Pay as you like, start learning right away

No subscription, no commitments. Pay the way you're used to via credit card and download your PDF document instantly.

Student with book image

“Bought, downloaded, and aced it. It really can be that simple.”

Alisha Student

Working on your references?

Create accurate citations in APA, MLA and Harvard with our free citation generator.

Learn more Create citation
Working on your references?

Frequently asked questions