×

### Let's log you in.

or

Don't have a StudySoup account? Create one here!

×

or

27

0

12

# Class Note for CHM 115 at IPFW 5

Marketplace > Indiana University > Class Note for CHM 115 at IPFW 5

No professor available

These notes were just uploaded, and will be ready to view shortly.

Either way, we'll remind you when they're ready :)

Get a free preview of these Notes, just enter your email below.

×
Unlock Preview

COURSE
PROF.
No professor available
TYPE
Class Notes
PAGES
12
WORDS
KARMA
25 ?

## Popular in Department

This 12 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at Indiana University taught by a professor in Fall. Since its upload, it has received 27 views.

×

## Reviews for Class Note for CHM 115 at IPFW 5

×

×

### What is Karma?

#### You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 02/06/15
Important Concepts in Chapter 3 1 How to calculate molecular weights for compounds 2 How to convert between grams moles and of atoms 3 How to convert a chemical analysis to an empirical formula 4 For a balanced chemical reaction what is the limiting reagent and theoretical yield But why is this important Automobile Air Bags NaN3S 9 NaS N29 Molecular Weight and Formula Weight Section 31 Molecular Weight MW Units amu Formula Weight FW Units amu What is the molecular weight of P4010 What is the formula weight of Fe2SO43 The Mole Section 32 How do we count atoms ions molecules and formula units compounds One mole of a substance represents a number of atoms molecules or formula units The mole is an SI unit that represents an amount of a substance Mole mol quantity of a given substance that contains as many molecules or formula units as the number of atoms in exactly 120000000 g of carbon12 How many atoms are there in exactly 120000000 g of carbon12 6022 x 1023 Avogadro s Number NA 1 mole 6022 x 1023 atoms molecules formula units The Mole Cont 1 mole of Na2003 formula units of NaZCO3 1 mole of Na2003 ions of Na 1 mole of Na2003 ions of 003239 1 mole of Na2003 atoms of O 1 mole of Na2003 atoms of C Molar Mass Molar Mass MM mass in grams of one mole of a substance grams OF L mole mol Units For all substances the molar mass glmol is equal to the formula weight in atomic mass units amu Formula Weight of Fe2SO43 399880 amu Molar Mass of Fe2SO43 399880 glmol 1 m0e Of FezSO43 g FezSO43 mass Molar Mass 2 mole grams Mole Calculations What is the mass of 50 mol Cu moles of atoms molecules How many moles of PbCrO4 MM 323 gmol are there in 985 g of PbCrO4 The molar mass of aspirin is 1802 gmol How many aspirin molecules are present in one 250mg tablet Percent Composition Section 33 Percentage composition Mass percentage Mass A 2 mass of A 1n the Whole X 100 mass of the Whole Example Calculate the mass percentages to 3 Sig Figs of the elements N H and O in ammonium nitrate NH4N03 Elemental Analysis Section 34 Elemental Analysis method to determine the percentage composition of all the elements in a compound Example When a 387 9 sample of ascorbic acid is completely burned in the presence of 029 580 g of 002 and 158 g of H20 are produced What is the percentage composition of ascorbic acid Ascorbic acid only contains C H and O Empirical Formula and Molecular Formula Section 35 Emperical Formula Molecular Formula Four Types of Calculations 1 determine empirical formula from masses of the elements in a compound HW problem 357 2 determine empirical formula from percentage composition HW problem 359 3 determine molecular formula from empirical formula using molecular weight HW problem 365 not assigned 4 determine molecular formula from percentage composition and molecular weight HW problem 367 Empirical Formula and Molecular Formula Cont Problem 365 Putrescine is a substance produced by decaying animals It has an empirical formula of CZHBN The molecular weight of putrescine is approximately 90 amu What is the molecular formula for putrescine Empirical Formula and Molecular Formula Cont An elemental analysis of an unknown compound shows that it contains 449 K 184 S and 367 0 What is its empirical formula What is the molecular formula of this unknown compound if the molar mass was experimentally determined to be approximately 175 gmol Empirical Formula and Molecular Formula Cont Elemental analysis shows an unknown carbohydrate contains 200 9 carbon 336 9 hydrogen and 267 9 oxygen What is the empirical formula for this unknown carbohydrate What is the molecular formula of this unknown carbohydrate if the molar mass was experimentally determined to be approximately 178 gmol

×

×

### BOOM! Enjoy Your Free Notes!

×

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

## Why people love StudySoup

Jim McGreen Ohio University

#### "Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

Janice Dongeun University of Washington

#### "I used the money I made selling my notes & study guides to pay for spring break in Olympia, Washington...which was Sweet!"

Bentley McCaw University of Florida

Forbes

#### "Their 'Elite Notetakers' are making over \$1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!
×

### Refund Policy

#### STUDYSOUP CANCELLATION POLICY

All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email support@studysoup.com

#### STUDYSOUP REFUND POLICY

StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here: support@studysoup.com

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to support@studysoup.com