Chapter 3 Question 20

Photochromic glass contains silver chloride which turns the lens dark when it is exposed to sunlight. A solution containing 1.9 g of magnesium chloride is added to an excess solution of silver nitrate. Calculate the maximum mass of silver chloride obtained. (R.A.M: Mg, 24; Cl, 35.5; Ag, 108)

Chapter 3 Question 19

Propene burns in oxygen as follow:
2C3H6 + 9O2 = 6CO2 + 6H2O
What is the volume of carbon dioxide produced at STP from a complete burning of 21 g of propene?

Chapter 3 Question 18

Which of the chemical equations below is NOT correctly balanced

A 2Al + 6HCL -> 2AlCl3 + 3H2
B 2Na + 2H2O -> 2NaOH + H2
C Fe3O2 + 2H2 -> 3Fe + 2H2O
D 2Pb(NO3)2 -> 2PbO + 2NO2 + O2

Chapter 3 Question 17

5.4 g of metal M combined with 4.8 g of oxygen to form a compound with the empirical formula M2O3. Determine the relative atomic mass of metal M. (R.A.M: O, 16)

Chapter 3 Question 16

Iron fumarate is used as iron supplement to treat anaemia. It is found that the compound contains 28.2% carbon, 1.2% hydrogen, 33.0% iron and 37.6% oxygen by mass. Determine the empirical formula of iron fumarate. (R.A.M: H, 1; C, 12; O, 16; Fe, 56)

Chapter 3 Question 15

Capsaicin is a compound found in chilli which gives it a hot taste. The compound capsaicin contains 4.32 g carbon, 0.54 g hydrogen, 0.28 g nitrogen and 0.96 g oxygen. Determine the empirical formula of capsaicin. (R.A.M: H, 1; C, 12; N, 14; O, 16)

Chapter 3 Question 14

A skin whitening cream contains an oxide of metal M. The metal oxide is reduced in a combustion tube by passing hydrogen gas through it. The result of the experiment is tabulated below.
Mass of empty combustion tube = 35.70 g
Mass of combustion tube + metal oxide (before reduction) = 39.70 g
Mass of combustion tube + metal (after reduction) = 38.10 g
Determine the empirical formula of this metal oxide. (R.A.M: O, 16; M, 48)