Things to remember:
-Avogadro's number (SUPER IMPORTANT!!)
-how to calculate molar mass
-the "magic 1" rule
OK. Let's start converting!!
*For these conversions, we'll need to use Avogadro's number: 6.022x10^23*1. particles-->moles
4.24x10^24 C particle-->moles
1.34 moles moles CO2-->molecules
1.34moles x 6.022x10^23 molecules = 8.07x10^23 molecules of CO2
These conversions do not require Avogadro's number. They instead, require a periodic table. Remember how to calculate molar mass!3. moles-->grams
6.5 moles of C-->grams *Use molar mass of C=12.0g/mol
6.5 moles x 12.0g/mol = 78 grams of C
8.2 grams of MgCl2-->moles *Use molar mass of MgCl2=95.3g/mol
8.2 grams x 1 mole = 0.086 moles of MgCl2
YAY!! So now, you should know how to convert from moles<->particles and moles<-> grams.
Just for some extra practice, here are a few questions:
1. How many moles of O2 are in 5.53x10^41 molecules of Ag?
2. How many atoms are in 2 moles of C?
3. How many moles are in 94.0g of Pb?
4. Calculate the mass (g) of 7.42x10^12 atoms of C.
And, lastly, here's a video to summarize the converting stuffs. Don't get distracted by the music!
Written by Jialynn.