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. Gravimetric analysis is widely used in the mining and metal-alloy industries to determine
chemical composition. An iron ore is analyzed for the iron (FW = 55.845 g/mol) content by
converting it to Fe2O3 (FW = 159.69 g/mol) precipitate.
a) If the iron content is in the range of 8% to 15%, what is the minimum mass of
sample (in four significant result) required to obtained 100.0 mg of precipitate?
[4 Marks]
b) Calculate the percent by mass of iron in the precipitate if 1.52 g sample yields
0.126 g Fe2O3.
[4 Marks]
c) Explain how the von Weimarn ratio can affect the particle sizes of precipitate.
[2 Marks]
A 7.00 L tank at 0.543°C is filled with 8.89 g of dinitrogen difluoride gas, 9.41 g sulfur tetrafluoride gas and 9.93 g of chlorine pentafluoride gas. You can assume that the gases behave as ideal gases under these conditions.
A 7.00 L tank at 0.543°C is filled with 8.89 g of dinitrogen difluoride gas, 9.41 g sulfur tetrafluoride gas and 9.93 g of chlorine pentafluoride gas. You can assume that the gases behave as ideal gases under these conditions.
A chemist makes 850.mLof silver(II) oxide AgOworking solution by adding distilled water to 170.mLof a 153μM stock solution of silver(II) oxide in water.Calculate the concentration of the chemist's working solution. Be sure your answer has the correct number of significant digits.
A chemist prepares a solution of sodium chloride
NaCl by measuring out 15.8g of sodium chloride into a 500.mLvolumetric flask and filling the flask to the mark with water.Calculate the concentration in /molLof the chemist's sodium chloride solution. Be sure your answer has the correct number of significant digits.
A chemist prepares a solution of zinc oxalate ZnC2O4by measuring out 1.31mg of zinc oxalate into a 150.mLvolumetric flask and filling the flask to the mark with water.Calculate the concentration in /molLof the chemist's zinc oxalate solution. Be sure your answer has the correct number of significant digits
Calculate the volume in liters of a 0.025/molLsodium carbonate solution that contains 7.00mol of sodium carbonate Na2CO3. Be sure your answer has the correct number of significant digits.
An unknown compound has the following chemical formula:
PxCl4where x stands for a whole number.Measurements also show that a certain sample of the unknown compound contains 5.7mol of phosphorus and 11.18mol of chlorine.Write the complete chemical formula for the unknown compound.
WATER IS MADE GERM FREE BY BOILING IT AT
Gaseous methane CH4reacts with gaseous oxygen gas O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. What is the theoretical yield of water formed from the reaction of 5.8gof methane and 6.9g of oxygen gas?Round your answer to 2
significant figures.
