Emprical and Molecular Formulas

Emprical and Molecular Formulas - for each element in the...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
15:19 Percent Composition Can describe compounds by  Percentage by Weight  of Elements present Mass (g) of element in 100 g of compound Percent Composition to Empirical Formulas 1. Assume there is 100 g of the sample a. Percent composition will now equal the number of grams of each  element 2. Use the molar masses  to convert the grams of each element into the moles  of each element. 3. Divide the smallest number of moles  of an element into the moles of each  element present. 4. Convert the fractional rations into whole numbers  by multiplying.  5. The resulting numbers are the subscripts
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: for each element in the empirical formula. 6. Be able to do this in reverse! Mass Spectrometry and Molecular Mass All mass spectrometers separate atoms and molecule by first converting them into ions and then separating those ions based on the ratio of their masses to their electric charges. Determining the Molecular Formula Must be an integer factor of the empirical mass Multiply all subscripts in the empirical formula by the same factor Can be determined from the percent composition and mass spectral data...
View Full Document

This note was uploaded on 03/12/2012 for the course CHEMISTRY 131 taught by Professor Lacey during the Fall '11 term at SUNY Stony Brook.

Page1 / 2

Emprical and Molecular Formulas - for each element in the...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online