Question

Using the atomic weights of selected elements given below, find the formula weights for the following compounds:

Atomic weights of selected elements

Ca = 40 g moL^-1, C = 12 g moL^-1, O = 16 g moL^-1, H = 1 g moL^-1, P = 31 g moL^-1, K = 39 g moL^-1 Si = 28 g moL^-1, Al = 27 g moL^-1, S = 32 g moL^-1, N = 14 g moL^-1

Example: (NH₄)₂SO₄

Element	no. of moles	Atomic wt. (g moL-1)	no. moles x Atomic wt.
S	1	32	32
O	4	16	64
N	2	14	28
H	8	1	8
Formula wt.= Σ(no. moles x Atomic wt.) =			132

Compound	Formula weight (g moL-1)
(1pt) CaCO3
(1pt) Ca(OH)2
(1pt) CaO
(1pt) P2O5
(1pt) K2O
(1pt) SiO2 (quartz)
(2pt) KAl3Si3O10(OH)2 (muscovite)
(1pt) CO2