Sodium Thiosulfate and Molar Mass

This video tutorial explains how to calculate the molar mass of sodium thiosulfate (Na2S2O3). It begins by identifying the atomic masses of sodium, sulfur, and oxygen from the periodic table. The video then demonstrates how to multiply these atomic masses by the number of each type of atom in the compound. Finally, it sums these values to find the total molar mass of Na2S2O3, which is 158.12 grams per mole. The tutorial concludes with a note on potential variations in results due to differences in periodic table precision.

What is the atomic mass of sodium as mentioned in the video?

• 16.00 grams per mole

• 158.12 grams per mole

• 32.07 grams per mole

• 22.99 grams per mole

How many sodium atoms are present in sodium thiosulfate (Na2S2O3)?

• Two

• Four

• One

• Three

What is the atomic mass of sulfur used in the calculation?

• 158.12 grams per mole

• 16.00 grams per mole

• 32.07 grams per mole

• 22.99 grams per mole

How many oxygen atoms are present in sodium thiosulfate (Na2S2O3)?

• Four

• Two

• One

• Three

What is the calculated molar mass of sodium thiosulfate (Na2S2O3)?

• 22.99 grams per mole

• 16.00 grams per mole

• 158.12 grams per mole

• 32.07 grams per mole

Why might there be slight variations in the calculated molar mass?

• Different chemical formulas

• Different periodic tables have different atomic masses

• Incorrect number of atoms

• Calculation errors