Counting Particles : The Mole

What is the number of carbon atoms in 12g of ethanoic acid CH3COOH, Mr = 60?

• A

• B

• C

• D

Which of these molecular formulae are also empirical formulae?

• A

• B

• C

• D

Which volume of ethane gas, in cm3 , will produce 40cm3 of carbon dioxide gas when mixed with 140cm3 of oxygen gas, assuming the reaction goes to completion?

• A

• B

• C

• D

0.10mol of hydrochloric acid is mixed with 0.10mol of calcium carbonate.

• A

• B

• C

• D

What is the sum of the coefficients when the equation is balanced with whole numbers?

• A

• B

• C

• D

Which contains the greatest number of moles of oxygen atoms?

• A

• B

• C

• D

How many moles of FeS2 are required to produce 32g of SO2? (Ar :S = 32, O = 16)

• A

• B

• C

• D

The volume of a sample of gas measured at 27 C is 10.0dm3 . What is the temperature when the volume is reduced to 9.0dm3 at the same pressure?

• A

• B

• C

• D

16g of bromine react with 5.2g of metal, M, to form MBr2. What is the relative atomic mass of the metal M? (Ar :Br = 80)

• A

• B

• C

• D

An antacid tablet containing 0.50g of NaHCO3 (Mr = 84) is dissolved in water to give a volume of 250cm3 . What is the concentration, in moldm−3 , of HCO3 − in this solution?

• A

• B

• C

• D