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Tungsten trioxide (WO3) has a rich yellow color and is often used as a pigment in ceramics and paints. In order to test a ceramic vase for its WO3 content, a 10.18 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO3 to W3 . The resulting W3 was transferred to 500.0 mL of 1.00 M HCl. A 100.00 mL aliquot of the HCl solution required 12.26 mL of 0.08855 M potassium permanganate (KMnO4) to reach the purple endpoint. A blank required 0.22 mL. Balance the reaction below and determine the percent WO3 in the ceramic sample.
Calculate the expected pH from a test solution made only with 2.0 mL of 2.5 M sodium acetate
a sample of oxygen that occupies 1.00X 10^6 ml at 575 mm hg is subjected to a pressure of 1.25 atm. what will the final volume of the sample be if the temperature is held constant?
To determine the number of molecules present in air using the ideal gas law and Avogadro's number - how many molecules of each type of gas are present in 1.0 L of air at STP?
If the average human body discharges 925.0g CO2 per day, how many moles of NaOHare needed each day for each person in the spacecraft?( 42.04 mol NaOH)
What would be the product if a 1:1 mole ratio of benzaldehyde to acetone was used in an Aldol condensation?
determine the solubility of CO2 in soda water at 25 degreeC if the pressure of CO2 is 5.2 atm
A solution of ethanol (C2H5OH) in water is prepared by dissolving 60.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 235.0 mL of solution. What is the molarity of the ethanol in this solution?
The mass of the sample before heating was 3.327g and after heating the mass was 2.432g. What is the percent composition of sodium carbonate in the original mixture?
The value of E° for each of the cells is 2.04 V. Suppose that in starting a car on a cold morning a current of 108 A is drawn for 14 seconds from the car battery. How many grams of Pb would be consumed? (M r(Pb)=207.19 g/mol)
The half-life for the reaction at 550 C is 81.3 seconds. How long does it take for 78.5% of a phosphine sample to decompose?
Explain the factors that affect the acidity of carboylic acids. Why does this matter/ give evidence to support your claims and use a reaction
A certain second-order reaction (B--> products) has a rate constant of 1.40×10^-3 M^-1*s^-1 at 27 Celsius and an initial half-life of 280s . What is the concentration of the reactant B after one half-life?
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