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A solution is prepared by dissolving 0.535 g of NH4Cl in 250.0 ml of 0.080 M NH3. a. Calculate the pH of the above mixture. Kb = 1.8 x 10-5
The compound ZnI4 is best described as anions in a face-centered cubic unit cell with the cations in the tetrahedral holes. What is the density of this compound? The radius of I- is 216 ppm, and the
Derive a frequency response curve for a low-pass RC filter in which R= 2.5 k ohms and C = 0.015 F. Cover a range of (Vp)0/(Vp)1 of 0.00I to 0.999. Plot (Vp)0/(Vp)i versus in f
The calorimeter had a heat capacity of 950.0 J °C-1. The temperature of the entire system rose from 25.30 °C to 26.59 °C. Calculate the heat of reaction, in kJ, per mole of KOH(aq).
Explain why the swirling of a solution and its drying agent hastens the drying process.
To obtain the same antifreeze protection requires 76g of propylene glycol to replace each 62g of ethylene glycol. Calculate the mass of propylene glycol required to replace 7.00gal of ethylene glyco
What will be the volume of the gas sample if the pressure increases to 820 mm and the temperature increases to 55°C?
In a coffee cup calorimeter 50.0 mL of 1.0 M NaOH and 50 mL of 1.0 M HCl are mixed. Both solutions are originally at 23.0 oC. After the reaction, the temperature is 30.0oC. Assuming all solutions h
If a 210 mg piece of gold (density =19.32 g/cm^3 ) is hammered into a sheet measuring 2.5 x 1.0 ft , what is the average thickness of the sheet in meters?
If 12.5 g of iron(III) oxide (rust) are pro- duced from 8.74 g of iron, how much oxygen gas is needed for this reaction?
A 322 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 635 mmHg. Calculate the moles of Ar present.
What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of the work needed to solve this problem.
If 50.0 of ethanol (density 0.789g/mL) initially at 6.0 is mixed with 50.0 of water initially at 28.2 in an insulated beaker, and assuming that no heat is lost, what is the final temperature of the
If the methane contained in 4.00 L of a saturated solution at 25 ^circ rm C was extracted and placed under STP conditions, what volume would it occupy?
Calculate the force on the piston if the pressure in the gas is measured to be. Write your answer in units of kilonewtons. Be sure your answer has the correct number of significant digits.
If the container is compressed to 2.90 and the temperature is increased to 35, what is the new pressure, inside the container? Assume no change in the amount of gas inside the cylinder.
A 55.0-L steel tank at 20.0°C contains acetylene gas, C2H2, at a pressure of 1.39 atm. Assuming ideal behavior, how many grams of acetylene are in the tank?
Ethanol melts at -114C and boils at 78C. It's density is 0.789 g/mL. The enthalpy of vaporization is 38.56 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heat of solid liquid
The value of Eo for the following reaction is 0.63V. What will the cell potential be when the [Zn2+] = 0.00020M and the [Pb2+] = 1.0M?
An automobile gasoline tank holds 21kg of gasoline. When the gasoline burns, 86kg of oxygen is consumed and carbon dioxide and water are produced. What is the total combined mass of carbon dioxide a
A 1.00 L flask containing 14.8 g NaHCO3 is evacuated and heated to 125°C. Calculate the partial pressures of CO2 and H2O after equilibrium is established
Sodium will react with oxygen to form sodium oxide. Use the formula below to determine how many grams of sodium oxide will be formed if 46 grams of sodium are used in the reaction.
Hexane, chloroform, methanol, and water are passed through the column in that order. rationalize the order in terms of intermolecular forces and the mutual solubility of the solvents.
A 0.0355 g sample of an unknown molecular compound is dissolved in 1.000 g of liquid camphor at 200.0°C. Upon cooling, the camphor freezes at 157.7°C. Calculate the molar mass of the unknow
A graduated cylinder contains 18.0 m/L of water. What is the new water level after 35.6 g of silver metal with a density of 10.5 g/mL,is submerged in the water?