Quiz 2 Sec. 1

In 2 moles of benzene C₆H₆ there are ………………..molecules

• ( 2X 6.02x10²³ )

• ( ½ X 6.02x10²³ )

• ( 12 X 6.02x10²³ )

• 12

The number of moles in 48 gm of ozone is ………………………moles (O=16)

• 1

• 2

• 3

• 4

In the reaction below: 2FeSO4 → Fe2O3 + SO2 + SO3

The number of Sulpher trioxide molecules which are produced from thermal decomposition of 2.6 moles of iron (II) sulphate is ………

• 6.02 x 10²³

• 7.826x10²³

• 24.08x10²³

• 12.04x10²³

A chemical reaction involving substances A and B stops when B is completely used. B is the

• excess reactant.

• limiting reactant.

• primary reactant.

• primary product.

In most chemical reactions the amount of product obtained is

• equal to the theoretical yield.

• less than the theoretical yield.

• more than the theoretical yield.

• more than the percentage yield.