Solution

Compound	Mass
Pb	207
PbX	223
PbX2	239
Pb3X4	600 480 685 356 781

Compound	Mass
X	51 41 31 61 71
XCl2	122.6
XCl3	157.5
XCl5	200.5 228.5 288.5 306.6 276.5

Manganese has many oxides.
The atomic masses of oxygen and manganese are 16 an 55 respectively.
An oxide of manganese has the formula Mn_xO_y and a formula mass of 222.
Below are some oxides of manganese. Which is the likely formula of the oxide?
a) MnO
b) Mn₂O₃
c) Mn₂O₇
d) MnO₄
e) Mn₂O₄

_{a) b) c) d) e)}