Atomic Mass: - PowerPoint PPT Presentation

1 / 17
About This Presentation
Title:

Atomic Mass:

Description:

unit used to express the mass of an atom or subatomic particle ... A can of diet Mountain Dew contains 35 mg Na. How many sodium atoms are in this serving? ... – PowerPoint PPT presentation

Number of Views:675
Avg rating:3.0/5.0
Slides: 18
Provided by: virginia59
Category:
Tags: atomic | mass

less

Transcript and Presenter's Notes

Title: Atomic Mass:


1
Atomic Mass
  • The mass of an atom (amu).
  • a weighted average of the masses of isotopes of
    an element.

2
Atomic Mass Unit (amu)
  • unit used to express the mass of an atom or
    subatomic particle
  • 1 amu 1/12th of the mass of a C-12 atom

3
Molecular Mass
  • Total mass of the atoms in one molecule
  • measured in atomic mass units.

4
Formula Mass
  • Total mass of the atoms in an ionic compounds
    empirical formula
  • measured in amus.

5
Glucose C6H12O6
  • Molecular mass ?
  • Empirical formula ?
  • Formula mass ?

180.0 amu
CH2O
30.0 amu
6
List the following for Benzene
  • Molecular formula
  • Molecular mass
  • Empirical formula
  • Formula mass

C6H6
78.0 amu
CH
13.0 amu
7
List the following
  • Formula mass of baking soda
  • Atomic mass of zinc
  • Formula mass of Ba Bromide
  • Atomic mass of Mn
  • Formula mass of NaOH

84.0 amu
65.4 amu
297.1 amu
54.9 amu
40.0 amu
8
  • If the mass of one amu is 1.66 x 10-24 grams, how
    many amus are in one gram?

9
Avogadros Number
  • 6.02 x 1023
  • the number of particles in a mole

10
Mole
  • 6.02 x 1023
  • SI unit used to count numbers of particles
  • Has the same number of grams in a mole as amus
    in one particle of the substance

11
Molar Mass
  • The mass (in grams) of one mole of a substance.

12
How many atoms are in 3.4 mole Al?
  • 3.4 mol Al 6.02x1023 atoms 1 mole

2.05x1024 Al atoms
13
Cesium bromide is used to make optical devices
  • How many moles are in 9.46 g?

14
Tin (II) chloride is used to plate tin on steel
cans
  • How many grams are in 2.5 moles?

15
Find the masses of
  • 5.5 moles NaOH
  • 0.89 moles CaCl2
  • 1 mole oxygen

16
Find the following
  • moles PbSO4 in 158.1 g
  • number of atoms in 0.58 moles Se
  • number of atoms in 56.3 g. Cu

17
Problem
  • A can of diet Mountain Dew contains 35 mg Na.
    How many sodium atoms are in this serving?
Write a Comment
User Comments (0)
About PowerShow.com