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What volume in milliliters of a 0.5 solution of copper ll sulfate, CuSO4, is needed to react with an excess of aluminum to provide 11g of copper?
Sodium thisulfate, Na2S2O3, is used as a fixer when developing photographic film. What is the mass in grams of Na2S2O3 needed to make 100ml of a 0.25 solution?
A solution of ethanol (C2H5OH) in water is prepared by dissolving 62.0 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
5.0 g of NaNO3 is dissolved in 50.0 g of water. The initial temperature of the water was 21.0 degrees C and the final temp. Calculate the heat of solution per mole of NaNO3.
A vitamin C capsule is analyzed by tirating with 0.3M NaOH. It is found that 24.4 ml of base is required to react with a capsule weighing 0.55g. What is the percentage of vitamin C, C6H8O6, in the c
The concentration of alcohol (CH3CH2OH) in blood, called the blood alcohol concentration of BAC, is given in units of grams of alcohol per 100ml of blood. The legal definition of intoxication, in ma
How many grams of sodium lactate should be added to 1.00 L of 0.150 lactic acid ( or ) to form a buffer solution with = 4.10? Assume that no volume change occurs when the sodium lactate is added.
If an automobile travels 245 mi with a gas mileage of 21.5 mi/gal , how many kilograms of CO_2 are produced? Assume that the gasoline is composed of octane, , whose density is 0.69 g/mL.
Solid sodium reacts violently with water, produing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water?
An aqueous vinegar sample contains 5.4% acetic acid by mass and has a density of 1.006 g/mL. Calculate the amount of acetic acid in grams in 2.00 L of this vinegar. Report your answer using the corr
An aqueous solution contains 4.20% NH3 (ammonia) by mass. The density of the aqueous ammonia is 0.979 g/mL. What is the molarity of NH3 in the solution?
A student placed 15.0 g of glucose (C6H1206) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-mL mark on the neck o
How much heat is released at constant pressure when 50.0 g of NiS reacts with excess O2 according to the reaction below?
What is the pressure of a container that has 7 atm pressure coming from O2, 2 atm of pressure coming from N2, 3 atm of pressure coming from CO2?
A gas mixture composed of helium and argon has a density of 0.853g/L at a 745mmHg and 298K. What is the composition of the mixture by volume?
Assume that a particular process evolves 224 kJ of heat and that 35 kJ of PV work is done on the system at constant pressure. What are the Enthalpy Change & The Internal Energy Change for this
A gas sample has an original volume of 760 ml when collected at 720 mm and 25degC. What will be the volume of the gas sample if the pressure increases to 820 mm and the temperature increases to 30d
A generic salt, AB, has a molar mass of 243 g/mol and a solubility of 8.90 g/L at 25 C what is the Ksp of this salt.
A toxicologist studying mustard gas, S(CH2CH2Cl)2, a blistering agent, prepares a mixture of 0.675 M SCl2 and 0.973 M C2H4 and allows it to react at room temperature (20.0°C ).
A chemist wishing to do an experiment requiring 47Ca (half-life = 4.5 days) needs 5.0 mg of the nuclide. What mass of 47CaCO3 must be ordered if it takes 48 h for delivery from the supplier?
what is the final temperature of A metal sample weighing 34.526 g was heated to 98.0 degrees Celcius then quickly transferred into a styrofoam cup calorimeter containing 74.365 g of distilled water
If air contains 78% N2 by volume, what is the solubility of N2 in water of 25oC and 1 atm (Henry's constant kH for N2 in H2O at 25oC = 7 x 10-4 mol/L.atm)?
Assume that the partition coefficient, K, for partitioning of compound A between diethyl ether and water is 3; that is, A preferentially partitions into ether.
Calculate the total volume of gases when collected at 1.20 atm and 25 degrees Celsius from 261 grams of nitroglycerin. What are the partial pressures of the gases under these conditions.