Hon_Quiz 6: Molar Conversions

How many moles of sodium chloride are in a 321.8 g sample?

• 18810 moles

• 3.315 x 10²⁴ moles

• 5.507 moles

• 4.767 moles

What is the mass of 2.50 mol of oxygen gas O₂?

• 40.0 g
• 80.0 g
• 16.0 g
• 32.0 g

What is the molar mass of Carbon Dioxide (CO₂) ?

• 44.01 g/mol
• 18.02 g/mol
• 32.00 g/mol
• 28.02 g/mol

How many atoms would be contained in 454 grams of iron (Fe)?

• 6.02x10²³ atoms
• 8.14 atoms
• 4.90x10²⁴ atoms
• 55.85x10²³ atoms

How many molecules are in 32.4 grams of phosphorous pentoxide (P₂O₅)?

• 1.37 x 10²³ molecules

• 0.29 moles
• 1.76 x 10²² molecules
• 0.29 molecules

How many moles of copper (II) chlorate, Cu(ClO₃)₂ are contained in 1.45x10²¹ molecules?

• 1.20x10^-3 moles
• 3.00x10^-2 moles
• 2.41x10^-3 moles
• 5.00x10^-4 moles

How many grams are in 3.3 mol of Potassium Sulfide (K₂S)?

• 360 g
• 454 g
• 238 g
• 132 g

How many grams are in 1.2 x 10²⁴ atoms of C?

• 28 grams
• 24 grams
• 6.02 grams
• 1.2 grams

You measure some chalk to be 5.62 grams. You go outside and use it to write down your name combined with your crushes name. You come back inside and weight your chalk to be 4.94 grams. If chalk's formula is CaCO₃ then how many moles of chalk did you use?

• 0.00845 moles
• 0.00679 moles

• 0.00367 moles
• 0.00512 moles