The Molecular Formula - PowerPoint PPT Presentation

1 / 5
About This Presentation
Title:

The Molecular Formula

Description:

The Molecular Formula The empirical formula CH has a molar mass of 13 g/mol. Acetylene, ... Determining a Molecular Formula The empirical formula for ribose is CH2O. – PowerPoint PPT presentation

Number of Views:100
Avg rating:3.0/5.0
Slides: 6
Provided by: nsca150
Category:

less

Transcript and Presenter's Notes

Title: The Molecular Formula


1
The Molecular Formula
  • Chemistry 11
  • Ms. McGrath

2
The Molecular Formula
  • The empirical formula CH has a molar mass
  • of 13 g/mol.
  • Acetylene, C2H2, and benzene, C6H6 both
  • have the empirical formula CH.
  • Suppose its been determined through mass
  • spectrometry that a sample has a molar mass
  • of 78 g/mol. The compound must be C6H6,
  • since 6 x 13 g 78 g.

3
Determining a Molecular Formula
  • The empirical formula for ribose is
  • CH2O. In an experiment, using a mass
  • spectrometer, the molar mass of ribose
  • was determined to be 150 g/mol. What
  • is the molecular formula for ribose?

4
Determining a Molecular Formula
  • The molar mass of the empirical formula
  • CH2O is 30 g/mol.
  • The molar mass of ribose is 150 g/mol.
  • 150 g/mol 5
  • 30g/mol
  • Molecular formula subscripts 5 x empirical
    formula
  • subscripts
  • C1 x
    5H2 x 5O1 x 5
  • C5H10O5

5
Determining a Molecular Formula
  • You try page 97, 17 - 19
Write a Comment
User Comments (0)
About PowerShow.com