CHEM 2011 Lecture 24: partial pressures and mole fractions
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6 Oct 2017
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Related Questions
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 |