Stoichiometry and Molar Calculations

The video tutorial covers various chemistry calculations, including determining the molar mass of sodium carbonate, converting grams to formula units for sodium oxide, converting atoms to grams for gold, calculating the mass of iron II fluoride from moles, and converting grams to moles for copper nitrate. Each section involves step-by-step problem-solving using the periodic table and basic chemistry formulas.

What is the molar mass of sodium carbonate (Na2CO3)?

• 106 grams per mole

• 84 grams per mole

• 92 grams per mole

• 100 grams per mole

How many formula units are in 29 grams of sodium oxide (Na2O)?

• 4.0 x 10^23

• 2.8 x 10^23

• 3.5 x 10^23

• 1.5 x 10^23

What is the mass of 7.6 x 10^24 atoms of gold (Au)?

• 2487 grams

• 1970 grams

• 3000 grams

• 1500 grams

Calculate the mass of 12.7 moles of iron(II) fluoride (FeF2).

• 1300 grams

• 1100 grams

• 1193.8 grams

• 1000 grams

How many moles are present in 22 grams of copper nitrate?

• 0.45 moles

• 0.55 moles

• 0.25 moles

• 0.35 moles