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a. Determines the mass of an unknown gas to be .43 grams at 37 C as well as 720 mm Hg in a 250 mL container. Explain what is the molecular mass of the unknown gas? Use n=(PV/RT) but a little confused on where to proceed.
b. A gas is enclosed in a cylinder fitted with a piston. The volume of the gas is 1.50L at .86 atm. If the piston is moved to increase the gas pressure to 2.33 atm, explain what will the final volume be?
A solution of ethanol (C2H5OH) in water is prepared by dissolving 67.5 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?
What is the final pH if .2 mol HCL is added to .5L of a buffer solution formulated using .28 M NH3 and .22 M NH4CL?
Use ΔG=ΔH-TΔS to calculate the standard free energy change, ΔG, at 25oC for the following reaction: CaCO3(s)-->CO2(g) + CaO(s)
Write a mechanism for the conversion of 1-butanol to 1-butyl bisulfate, indicating the flow of electrons.
In an equilibrium mixture the partial pressures of SO 2 and O 2 are 0.125atm and 0.460atm , respectively. What is the equilibrium partial pressure of SO 3 in the mixture?
In a reaction 8200 g of sodium reacts with 74.00 g of ferric oxide to form sodium oxide and iron metal. Calculate the mass of sodium iron produced.
In the laboratory a student combines 26.4 mL of a 0.182 M potassium bromide solution with 17.2 mL of a .329 M potassium bromide solution. What is the molarity of KBr in the final solution
A solution of NH4Cl is prepared and its molarity is 1.00 x 10-3; what is the pH of this solution. Show all work.
A 250 mL stock solution contains 2.3 M Ca(CN)2. When 100 mL of the stock solution is diluted to 125 mL, how many moles of CN- ions will be contained in the dilute solution.
Briefly explain which indicator, bromocresol purple (pKa = 6.3; from yellow to purple) or thymolphthalein (pKa= 10.0; from colourless to blue), would be better for use in this titration
The material was used for thermal insulation in the 2003 Mars Exploration Rover. If the maximum space for insulation in the spacecraft's hull was 2294 cm3, what mass (in grams) did the aerogel insulation add to the spacecraft?
which compunds moves to the aqueous NaOH? Provide the chemical reaction that occured when NaOH was added. Clearly indicate the different between ionic bond and covalent bond.
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