JAMB - Chemistry (2001 - No. 5)
An oxide XO\(_2\) has a vapour density of 32. What is the atomic mass of X?
32
20
14
12
คำอธิบาย
Relative molecular mass of XO\(_2\) = 2 × vapour density
Relative molecular mass → (2 x 32) = 64
Atomic mass of X:
X + [16 x 2] = 64
X = 64 - 32
= 32