Molecular Mass

What is the unit of relative molecular mass?

• kilogram

• gram

• gram per mole (g/mol)

• no units

The formula of a compound is M(OH)₂. Given that the M_r of the compound is 90, calculate the A_r of M.

• 32

• 56

• 64

• 94

K3PO4

• 98.1 u

• 212 u

• 74.1 u

• 23.5 u

Al(OH)3

• 78.0 u

• 74.7 u

• 22.3 u

• 10 u

LiOH

• 22.5 u

• 24.0 u

• 22.2 u

• 12.5 u

FeCl2

• 78.8 u

• 96.6 u

• 127 u

• 38.5 u

Zn(NO3)2

• 112 u

• 92 u

• 125.5 u

• 189 u

H2O2

• 34.0 u

• 62.2 u

• 33.0 u

• 28.5 u

Ni(NO3)2

• 160 u

• 162.3 u

• 100 u

• 183 u

Sr(NO3)2

• 212 u

• 206 u

• 62.2 u

• 33.5 u