Log in
HomeTextbook Notes300,000US110,000

CHE 131 Chapter Notes - Chapter 3.1: Molecular Mass, Molar Mass, Unified Atomic Mass Unit

51 views1 pages
School
Stony Brook University
Department
Chemistry
Course
CHE 131
Professor
Benjamin Hsaio, Jiangyong Jia, Roy Lacey

For unlimited access to Textbook Notes, a Class+ subscription is required.

jeffrey.dunn and 30 others unlocked
CHE 131 Full Course Notes
55
CHE 131 Full Course Notes
Verified Note
55 documents

Document Summary

Mole (mol) is the si unit for amount of substance that contains the same number of entities as the number of atoms in 12 g of carbon-12. The mass in (amu) of one atom of an element is the same numerically as the mass in grams of 1 mole of atoms. Ex: 1 atom of s has a mass of 32. 06 amu and 1 mol. The mass in amu of one molecule (format unit) of a compound is the same numerically as the mass in grams of 1 mole of compound. Ex: 1 molecule of h20 has a mass of 18. 02 and 1 mol. > the mole lets us relate the number of entities to the mass of a sample of those entities. > the mole maintains the same numerical relationship between mass on the atomic scale and mass on the macroscopic scale.

Get access

Grade+
$40 USD/m
Billed monthly
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
10 Verified Answers
Class+
$30 USD/m
Billed monthly
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
7 Verified Answers

Related Documents

CHE 131 Chapter Notes - Chapter 7: Unified Atomic Mass Unit, Barium Chloride, Calcium Fluoride
turquoiseoyster783
CHE 131 Chapter Notes - Chapter 3: Limiting Reagent, Molar Mass, Chemical Formula
bluerat278
CHE 131 Lecture Notes - Lecture 7: Sodium Chloride, Mass Spectrometry
viridianhare340

Related Questions

1. What is the molecular mass of Br2?

  1. 79.90 amu
  2. 79.90 g
  3. 159.8 amu  
  4. 159.8 g
  5. 2.65 x 1022 amu

 

2. What is the average mass, in grams, of one Zn atom?

  1. 65.39 amu
  2. 65.39 g
  3. 3.94 x 1025 g
  4. 1.09 x 10-22 g
  5. 1.661 x 10-24 g

 

3. What is the mass of 4.50 x 1022 Cu atoms?

  1. 7.47 x 102 g
  2. 7.47 x 102 amu
  3. 4.75 g
  4. 63.55 amu
  5. 63.55 g

 

4. One mole of iron?

  1. Is heavier than one mole of lead (Pb)
  2. is 77.0 g of iron
  3. is 26.0 g of iron
  4. weighs the same as one mole of lead.
  5. None of the above

 

5. Calculate the number of moles of xenon in 12.0 g of xenon.

  1. 1.00 mol
  2. 0.0457 mol
  3. 0.183 mol
  4. 7.62 x 10-3 mol
  5. 0.0914 mol

 

The mole is defined as the number of atoms in exactly 12 g of carbon-12. The mole equals 6.022×1023 items of whatever you are counting. This number is also called Avogadro's number, after Amadeo Avogadro (1776–1856). Molar mass is the mass of 1 mol of atoms of an element; for compounds, molar mass is the mass of 1 mol of molecules or formula units. Molar mass can be used to convert mass to moles for any element or compound.

How many grams are in 4.60 mol of sodium chloride (NaCl)?

How many water molecules are in a block of ice containing 2.25 mol of water (H2O)?