Molar Mass and Mole Calculations

The video tutorial covers various chemistry problems, including calculating moles in copper nitrate, mass of dinitrogen penta iodine, atoms of nitrogen in nitrogen gas, grams of oxygen in dinitrogen dioxide, grams of carbon in carbon dioxide, and atoms of hydrogen in carbon tetrahydride. Each problem is solved step-by-step, demonstrating the use of molar mass and Avogadro's number in calculations.

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

• 0.17 moles

• 0.22 moles

• 0.35 moles

• 0.45 moles

What is the molar mass of dinitrogen penta-iodide?

• 750 grams/mol

• 790 grams/mol

• 810 grams/mol

• 770 grams/mol

How many grams does 7.3 x 10^23 molecules of dinitrogen penta-iodide weigh?

• 958 grams

• 900 grams

• 1000 grams

• 850 grams

How many nitrogen atoms are in 1.9 x 10^23 molecules of nitrogen gas?

• 4.8 x 10^23 atoms

• 1.9 x 10^23 atoms

• 3.8 x 10^23 atoms

• 2.8 x 10^23 atoms

What is the mass of oxygen in 1.9 x 10^23 molecules of dinitrogen dioxide?

• 8.0 grams

• 10.1 grams

• 15.0 grams

• 12.5 grams

How many grams of carbon are in 4.4 moles of carbon dioxide?

• 52.8 grams

• 44.0 grams

• 60.0 grams

• 48.0 grams

What is the molar mass of carbon tetrahydride (CH4)?

• 14 grams/mol

• 20 grams/mol

• 18 grams/mol

• 16 grams/mol

How many molecules of CH4 are in 122 grams of carbon tetrahydride?

• 6.59 x 10^24 molecules

• 5.59 x 10^24 molecules

• 3.59 x 10^24 molecules

• 4.59 x 10^24 molecules

How many atoms of hydrogen are in 122 grams of carbon tetrahydride?

• 1.5 x 10^25 atoms

• 2.0 x 10^25 atoms

• 2.8 x 10^25 atoms

• 1.8 x 10^25 atoms

What is the molar mass of carbon dioxide (CO2)?

• 44 grams/mol

• 42 grams/mol

• 46 grams/mol

• 40 grams/mol