Moles and Gram Formula Mass

The video tutorial explains how to convert between moles and mass using the gram formula mass (GFM). It covers the necessary tools, such as a reference table and calculator, and provides detailed steps for calculating GFM using the periodic table. The tutorial includes examples of converting grams to moles and vice versa, emphasizing the importance of significant figures. It also demonstrates the calculation of GFM for various compounds and how to use these values to convert moles to grams.

What tools are necessary for converting between moles and mass?

• A calculator and a ruler

• A ruler and a periodic table

• A calculator and a periodic table

• A periodic table and a compass

How do you calculate the gram formula mass (GFM) of a compound?

• By dividing the atomic masses of all elements in the compound

• By multiplying the atomic masses of all elements in the compound

• By subtracting the atomic masses of all elements in the compound

• By adding the atomic masses of all elements in the compound

What is the GFM of sodium chloride (NaCl)?

• 58 grams per mole

• 74 grams per mole

• 98 grams per mole

• 158 grams per mole

When converting grams to moles, what operation is performed with the GFM?

• Subtract the mass from the GFM

• Add the mass to the GFM

• Multiply the mass by the GFM

• Divide the mass by the GFM

What is the result of converting 25 grams of NaCl to moles?

• 1.00 moles

• 0.63 moles

• 1.28 moles

• 0.43 moles

How many significant figures should be used when rounding 1.2755 to three significant figures?

• 1.3

• 1.28

• 1.27

• 1.275

What operation is performed when converting moles to grams using GFM?

• Subtract the moles from the GFM

• Add the moles to the GFM

• Divide the moles by the GFM

• Multiply the moles by the GFM

What is the mass in grams of 2.5 moles of a compound with a GFM of 58?

• 100 grams

• 150 grams

• 58 grams

• 145 grams

What is the GFM of potassium permanganate (KMnO4)?

• 158 grams per mole

• 98 grams per mole

• 74 grams per mole

• 250 grams per mole

What is the mass of 3.2 moles of a compound with a GFM of 250?

• 750 grams

• 800 grams

• 900 grams

• 850 grams