How many molecules are in 2.00 moles of #NO_2#?

1 Answer
Dec 29, 2016

Answer:

#1.20xx10^24 "molecules"# of #NO_2#

Explanation:

We are going to use dimensional analysis (method that allows you to convert from one unit of measurement to another by cancelling out unwanted units) and the relationship below:

http://www.slideshare.net/gbsliebs2002/moles-2313038

For questions like this I use the following technique:

#"Quantity Given" xx "Conversion Factor" = "Quantity Sought"#

#color(indigo)("Quantity Given:"# 2.00 moles

#color(coral)("Conversion Factor:"# #6.02xx10^23#

#color(orange)("Quantity Sought:"# molecules

Let's plug in our values:

#2.00cancel"mol"xx(6.02xx10^23"molecules")/(1cancel"mol")# = #1.20xx10^24 "molecules"#