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A fluorinated organic gas in a cylinder is compressed from an initial volume of 960 mL at 158 Pa to 478 mL at the same temperature. What is the final pressure? Answer in units of Pa.
In the titration of 50.0 mL of 1.0 M methylamine, CH3NH2 (Kb = 4.4 10-4), with 0.50 M HCl, calculate the pH under the following conditions.
Calculate the pH at each point indicated when 100 mL of .100 M HF is titrated with .200 M KOH: a) before addition of KOH b) after .15 mL KOH c)after addition of 50mL KOH d) after addition of 75 mL KOH
Calculate the percent of a strontium sample left after 100 years. The half-life of strontium-90 is 28.1 years.
Gas cylinder a has a volume of 48.2L and contains N2(g) at 8.35 atm at 25 degrees C. Gas cylinder b, of unknown volume, contains He(g) at 9.50 atm and 25 degrees C.
3.60 g of liquid methanol, CH3OH, is placed in an empty 20.0 L container at 45.0°C. If the volume of the container is compressed to 1.40 L at 45.0°C, how many grams of vapor are present?
What is the half-life of a compound if 87 percent of a given sample of the compound decomposes in 65 min? Assume first-order kinetics.
oleic acid has following compostions : 76.54%C, 12.13%H, 11.33% O. If the experimental molar mass is 282.g/mol, what is the molecular formula of oleic acid?
If the initial pressures of the H2 and N2 in the flasks were 360 torr and 240 torr respectively what would be the final pressure after the stopcock is opened.
What would be the molar concentration of NaClO if 90.0 mL of water were added to a 10.0 mL sample of the bleach?
To determine the order of reaction with respect to IO3-, use System 3 as the starting system and select another system (from Systems 4 - 6) where the [IO3- ] was doubled while the [HSO3- ] was held
If an automobile travels 235 mi with a gas mileage of 21.5 mi/gal, how many kilograms of CO2 are produced? Assume that the gasoline is composed of octane, C8H18, whose density is 0.69 g/mL.
If 9.00 of CaCl2 (Cl two)is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of solution Delta H solution of CaCl2 (Cl two)is -82.8 KJ/Mol.
Combustion analysis of 0.395 g sample of unknown compound produces 1.072 g CO2 and 0.307 g H2O. Analysis also indicates the presence the presence of 0.068 g N in the sample.
The extract and the insoluble residue both heated to dryness, could you determine the amounts of NaCl ,NH4Cl ,and SiO2 originally present? Why or why not?
The density of liquid oxygen at its boiling point is 1.14, and its heat of vaporization is 213. How much energy in joules would be absorbed by 2.0 of liquid oxygen as it vaporized?
125g of sodium oxide and carbon dioxide gas. if the reaction occurs at 784 torr and 32.5 C. What volume of carbon dioxide gas is produced?
How many kilojoules of heat are absorbed when 7.20g of MgO(s) is decomposed into Mg(s) and O2 (g) at constant pressure?
you purchase a cup of coffee, but, at 98.4 degrees C, it is too hot. You add 45.5 g of ice that is -2.2 degrees C to the 248ml of coffee. What is the final temperature of the coffee? (assume the hea
What is the vapor pressure depression of a solution of 135 g of CaCl2 in 225 g of water? Use molar masses with at least as many significant figures as the data give.
The term vapor pressure almost always means the equilibrium vapor pressure. What pysical arrangement is needed to measure vapor pressure?
Translate the following word equations into balanced chemical equations and explain how the equations represent what happens in grid spaces a and g.
Water and 8.00 mol/L potassium nitrate solution are mixed to produce 700 mL of a solution with a concentration of 6.00 mol/L. What volumes of water and potassium nitrate solution are used?
A 1004.0 g sample of calcium carbonate that is 95% pure gives 225 L of carbon dioxide at STP when reacted with an excess of hydrochloric acid. What is the density in g/L of the carbon dioxide?
What is the freezing point in Celsius of a solution prepared by dissolving 6.20 g of MgCl2 in 110 g of water? The value of Kf for water is 1.86 (C*kg)/mol), and the van't Hoff factor for MgCl2 is i