To convert 0.77 x 10^24 molecules (of any compound) to moles, we use Avogadro's number, which is approximately 6.022 x 10^23 molecules per mole.

Step 1: Determine the conversion factor
1 mole = 6.022 x 10^23 molecules

Step 2: Set up the conversion
0.77 x 10^24 molecules * (1 mole / 6.022 x 10^23 molecules)

Step 3: Calculate the result
0.77 x 10^24 / 6.022 x 10^23 = 1.28 moles

Step 4: Determine the correct significant figures
The original number, 0.77 x 10^24, has two significant figures, so the final answer should also have two significant figures. Therefore, the result is approximately 1.3 moles (rounded to two significant figures) of the compound.

For more practice and a better understanding of moles, grams, and other related concepts, you can check out the following resources:

• More Moles to Grams Practice:    • Practice: Converting between Moles an...  
• Molar Mass in Three Easy Steps:    • How to Calculate Molar Mass (Molecula...  
• Understanding the Mole:    • Understanding the Mole (the basics)  
• Moles Gram Conversions:    • Practice: Converting between Moles an...  
• How to Balance Chemical Equations:    • How to Balance Chemical Equations in ...  
• Mole Ratio:    • How to Find  the Mole Ratio to Solve ...  
• Reaction Stoichiometry:    • How to Solve Reaction Stoichiometry P...  

For further resources and information related to chemistry, visit my chemistry website: http://www.Breslyn.org.