Scan_Doc0101 - 3.8 Chemical Equations 97 What are the moles...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
3.8 Chemical Equations 97 What are the moles of each element in 1 mol caffeine? Carbon: 96.09 g-e 1 mol C 8.001 mol C X mol caffeine 12.01 g-e mol caffeine Hydrogen: 1O.0g-H 1 molH 9.92 mol H X mol caffeine 1.008 g-H mol caffeine Nitrogen: 56.07 g-N 1 mol N 4.002 mol N X = mol caffeine 14.01 g-N mol caffeine Oxygen: 32.02 g-{) 1 mol 0 2.001 mol 0 X = mol caffeine 16.00 g-{) mol caffeine Rounding the numbers to integers gives the molecular formula for caffeine: CgHION402' SEE EXERCISE 3.84 3.8 ~ Chemical Equations Chemical Reactions A chemical change involves a reorganization of the atoms in one or more substances. For example, when the methane (CH 4 ) in natural gas combines with oxygen (0 2 ) in the air and burns, carbon dioxide (C0 2 ) and water (H 2 0) are formed. This process is represented by a chemical equation with the reactants (here methane and oxygen) on the left side of an arrow and the products (carbon dioxide and water) on the right side: CH 4 + O 2 ~ CO 2 + H 2 0 Reactants
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/13/2010 for the course CHEM 2301 taught by Professor Bill during the Spring '10 term at South Texas College.

Ask a homework question - tutors are online