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Four beakers containing potassium nitrate dissolved in water are allowed to evaporate to dryness. Beakers 1 through 4 contain 2.3, 1.91, 5.985, and 0.52 g of dry potassium nitrate respectively.
A stream of toluene is mixed with a recycle stream and enters a reactor along with a stream of pure hydrogen. The reaction products at 510°C enter a condenser where they are cooled to 44.0°C
The concentration of Mg2+ in seawater is 0.052 M. What hydroxide concentration is needed to remove 90% of the Mg2+ by precipitation?
You\'d like to calculate the bubble-point temperature of the mixture, and the composition of the vapor formed at the bubble-point temperature two different ways.
What is the pressure of gas inside the cylinder at these initial conditions? Assume the combustion products behave ideally.
200 mL sample of lake water is contaminated with a single monoprotic acid. titrating this sample with a .005 M NaOH required 7.3 mL of the NaOH solution to reach the endpoint. what is the concentra
Nitrogen gas enters a 0.110-m diameter pipe at 30.0°C, 2.70 atm, and 7.20 m/s. The pipe then rises 26.0 ft and then falls 75.0 ft. The nitrogen gas exits the pipe at 30.0°C and 1.50 atm.
A 2.84g sample of an aqueous ionic salt with a molar mass of 99.37g/mol is added to a calorimeter (Ccal= 72.1J/°C) containing 74.61g of deionized water. The water is initially at 25.780C, after
50.00g of hot water is mixed with 50.00g of cold water Interpolating back to the time of mixing shows that the temperature of the hot water was 44.320C, the temperature of the cold water was 22.780C
Why is normal phase chromatography ideal for separating the components (chlorophyll a, b, and carotene) in a petroleum ether spinach extract? (why not reverse phase?)
The circle in the toluene ring is a representation of the composite of two resonance structures. Draw each resonance structure for toluene showing all its H's. What is the molecular formula for tol
How many grams of ice would be melted by the energy obtained as 23.4 g of steam is condensed at 100oC and cooled to 0oC?
Calculate the radius of the sphere that encloses a 50% probability of finding a hydrogen 1s electron. Repeat the calculation for a 90% probability.
A 100.0 mL sample of a 0.200 molar aqueous solution of K2CrO4 was added to 100.0 mL of a 0.100 molar aqueous solution of BaCl2. The mixture was stirred and the precipitate (BaCrO4) was collected, dr
Some ice cubes at 0 C with a total mass of 331 g are placed in a microwave oven and subjected 750. w (750. j/s) of energy for 5.00 minutes.assume that the energy of the microwave is absorbed by the
What is m4, the mass flow rate of water from the dryer? What is m1, the mass flow rate of aqueous FeSO4 solution entering the crystallizer?
Given the exothermic reaction: N2(g) + 3H2(g) ? 2NH3(g) ?H = -92.1 kJ. At 400 K, the equilibrium constant (Kc) is 0.53. At 800 K, what is the value of the equilibrium constant?
A 35.52g copper coil is removed from boiling water and is immediately immersed in a calorimeter with a constant of 63.2J/0C. The calorimeter contains 74.61g of water that is initially at 21.420C. Th
Enormous numbers of microwave photons are needed to warm macroscopic samples of matter. A portion of soup containing 295 g water is heated in a microwave oven from 26°C to 87°C, with radiati
Calculate the composition of the vapor phase at 25 °C if the vapor above the liquid phase is composed only of 1-propanol and 2-propanol.
A mixture of propane in air containing 4.03 mole% C3H8 is the feed to a combustion furnace. If there is a problem in the furnace, the mixture is diluted with a stream of pure air to make sure that i
A reaction has a standard free-energy change of -13.90 kJ mol-1 (-3.322 kcal mol-1). Calculate the equilibrium constant for the reaction at 25 °C.
If you wanted to prepare a solution of CO in water at 25 in which the CO concentration was 2.1 mM , what pressure of CO would you need to use?
Nitric acid is often manufactured from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming of natural gas, in a two-step process. In the first step, nitrogen and hydrogen
The activation energy of a certain reaction if 65.7kJ/mol. How many times faster will the reaction occur at 50 degrees Celsius than at 0 degrees Celsius? State the assumptions you need to make in o