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A gas mixture with a total pressure of 765 g contains each of the following gases at the indicated partial pressures: CO2, 116 mmHg ;A , 211 mmHg ; and O2 , 184 mmHg . The mixture also contains heli
After hours of counting, they turn in their total as 0.032 miles of balls. Show the steps the manager would follow to determine how many balls there are?
Calculate the heat of reaction for the same reaction where water is a gaseous product instead of a liquid.
How many of joules of heat are needed to raise the temperature of 10.0g of aluminum from 22 degrees C, if the specific heat of aluminum is 0.90 j/g degrees c.
How many moles of NO2 gas can be produced from 45.5 g of O2 gas in the following reaction? (show your work in the answer box - limit 100 caracters).
What is the half-life of a compound if 89 percent of a given sample of the compound decomposes in 56 min? Assume first-order kinetics.
Write a short paragraph that describes how electrons fit into these higher levels and that explains why a space must be left in the lower periods on the periodic table.
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