Atomic and Molecular Weights - Stoichiometry Chemical...

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

View Full Document Right Arrow Icon
Stoichiometry: Chemical Formulas and Equations Atomic and Molecular Weights Atomic and Molecular Weights The subscripts in chemical formulas, and the coefficients in chemical equations represent exact quantities. H 2 O, for example, indicates that a water molecule comprises exactly two atoms of hydrogen and one atom of oxygen. The following equation: not only tells us that propane reacts with oxygen to produce carbon dioxide and water, but that 1 molecule of propane reacts with 5 molecules of oxygen to produce 3 molecules of carbon dioxide and 4 molecules of water. Since counting individual atoms or molecules is a little difficult, quantitative aspects of chemistry rely on knowing the masses of the compounds involved. The atomic mass scale Atoms of different elements have different masses . Early work on the separation of water into its constituent elements (hydrogen and oxygen) indicated that 100 grams of water contained 11.1 grams of hydrogen and 88.9 grams of oxygen: 100 grams Water -> 11.1 grams Hydrogen + 88.9 grams Oxygen Later, scientists discovered that water was composed of
Background image of page 1

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

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

This note was uploaded on 11/22/2010 for the course ENGINEERIN 104791 taught by Professor Puteri during the Spring '10 term at International Islamic University Malaysia.

Page1 / 3

Atomic and Molecular Weights - Stoichiometry Chemical...

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