Porcelain Yellow
Posted in Antiques on 08/01/2010 12:34 am by admin
 |
| Powered by phpBay Pro |
2.09 of potassium is heated in a porcelain boat in a stream of oxygen that is diluted.when the reaction is?
complete, the material in the boat has been turned into yellow powder, and its mass is 3.80 g.
calculate in the form of percentages of potassium and oxygen, the chemical compound of potassium and oxygen that has been formed.
The material has gained 3.80g-2.09g = 1.71 g which we assume is all oxygen.
So there are 2.09 g of K*(mol/39.098g) = 0.0535 mol K
And there are 1.71 g of O*(mol/15.999g) = 0.1068 mol O
if you do a ratio there are one mole of O for every two mole of K. So you would have the empirical formula of K2O.
This is a yellow powder so the compound must be K2O.
As far as the percentage of each element, it depends if it is percent mass or percent by moles.
|
 REPRODUCTION YELLOW PORCELAIN CROWN 15 PLANTER  US $598.00
|
 Antique Porcelain Fischer Hungarian Yellow Lamp US $595.00
|
 Fine Famille Rose Porcelain Vase Yellow Ground US $585.00
|
 REPRO PORCELAIN BRASS YELLOW BIRDS PHOENIX VISTA VASE US $580.00
|
 Rare Superb yellow Famille Rose Porcelain Peach Vase US $550.00
|
 14K Yellow Gold Porcelain Cameo Pendant Pin Jewelry US $534.99
|
 Chinese BlueWhite Yellow glaze Porcelain plum vase US $450.00
|
| Powered by phpBay Pro |