Basic concepts

How many moles are in 44 g of CO2? (C = 12, O = 16)

• 1 2
• 2 0.5
• 3 44
• 4 1

The number of molecules in 2 moles of a gas is:

• 1 6.02 x 10^23
• 2 1.204 x 10^24
• 3 3.01 x 10^23
• 4 12 x 10^23 atoms

The empirical formula of a compound with the molecular formula C6H12O6 is:

• 1 CHO
• 2 CH2O
• 3 C2H4O2
• 4 C3H6O3

The limiting reagent in a reaction is the one that:

• 1 Is used up first
• 2 Is in excess
• 3 Is a catalyst
• 4 Is a gas

What volume does 1 mole of any gas occupy at STP?

• 1 1 dm3
• 2 24 dm3
• 3 22.4 dm3
• 4 11.2 dm3

The mass of one mole of NaCl is: (Na = 23, Cl = 35.5)

• 1 35.5 g
• 2 23 g
• 3 58.5 g
• 4 81.5 g

Percentage yield is:

• 1 Theoretical yield / actual yield x 100
• 2 Actual yield / theoretical yield x 100
• 3 Actual yield x 100
• 4 Theoretical yield only

Avogadro's number is the number of particles in:

• 1 One litre
• 2 One gram
• 3 One mole
• 4 One kilogram