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 Subject: chemistry Category: Science > Chemistry Asked by: teatea-ga List Price: \$2.00 Posted: 05 Jul 2003 17:42 PDT Expires: 04 Aug 2003 17:42 PDT Question ID: 225497
 ```How many moles of SO3 are in 2.4 x 10/24 molecules of SO3? a.0.25 b.3.4 x 10/22 c. 4.0 d. 2.9x10/-23```
 ```Hello teatea, The correct answer is (c) - 4 moles. Here is how this answer is calculated: Avogadro's number is the number of molecules in a mole of any molecular substance, and it is equivalent to 6.0221367 x 10/23 For example, see http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/idegas.html Scroll down to "The Mole" For the purposes of your question, we can round Avogadro's Number down to 6 x 10/23. You have 2.4 x 10/24 molecules of SO3. To get the number of moles, you need to divide this number by Avogradro's Number. 2.4 x 10/24 = 24 x 10/23 So you need to divide 24 x 10/23 by 6 x 10/23. The 10/23 cancels out, leaving 24 divided by 6 which equals 4. Search strategy: to get the relationship between Avogadro's Number, moles and molecules, the search used the terms: "Avogadro's number" mole molecules```