Molar Mass and Chemical Composition

The video tutorial explains how to calculate the molar mass of phosphoric acid (H3PO4). It begins by identifying the molar masses of hydrogen, phosphorus, and oxygen from the periodic table. The tutorial then calculates the contribution of each element to the total molar mass by multiplying the number of atoms by their respective molar masses. Finally, it sums these contributions to find the total molar mass of H3PO4, which is 98.00 grams per mole. The video concludes with a note on potential variability in results due to differences in periodic table data.

What is the molar mass of hydrogen as mentioned in the video?

• 1.00 grams per mole

• 1.10 grams per mole

• 2.02 grams per mole

• 1.01 grams per mole

How many hydrogen atoms are present in phosphoric acid (H3PO4)?

• One

• Two

• Three

• Four

What is the molar mass of phosphorus used in the calculation?

• 30.97 grams per mole

• 32.07 grams per mole

• 15.99 grams per mole

• 31.00 grams per mole

How many oxygen atoms are there in a molecule of phosphoric acid?

• Four

• Two

• Three

• Five

What is the total molar mass of phosphoric acid (H3PO4) as calculated in the video?

• 98.00 grams per mole

• 102.00 grams per mole

• 95.00 grams per mole

• 100.00 grams per mole

Why might the calculated molar mass differ slightly when using different periodic tables?

• Due to rounding differences

• Due to measurement errors

• Due to incorrect calculations

• Due to different chemical properties