Get college assignment help at uniessay writers At what speed (in meters per second) must a 145 g baseball be traveling to have a de Broglie wavelength of 0.500 nm?
Assume that a particular reaction evolves 235kJ of heat and that 24 kJ of PV work is gained by the system What is the delta H inside and the surroundings and delta E inside and out???
What volume of 0.750 M Na3PO4 is required to precipitate all the lead(II) ions from 130.0 mL of 0.300 M Pb(NO3)2
A solution of ethanol (C2H5OH) in water is prepared by dissolving 87.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?
If 5.4 kcal of heat is added to 1.00 kg of water at 100 degrees celsius, how much steam at 100 degrees is produced? Please show your work for your answer.
Zn(s) 2AgNO3(aq) –> 2Ag(s) Zn(NO3)2(aq) When 216 g of silver was produced, _____ mole(s) of silver nitrate would be required.
A calorimeter contains 29.0 of water at 14.5. When 2.50 of (a substance with a molar mass of 60.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 29.0.
The concentration of Mg2 in seawater is 0.046 M. At what pH will 99% of the Mg2 be precipitated as the hydroxide salt? [Ksp for Mg(OH)2 = 8.9 10-12.]
1. 1.467 g of an unknown hydrocarbon (122.2 g/mol) burns in bomb calorimeter in excess oxygen. The heat capacity of the calorimeter,Cv, = 5.748 kJ/ºC and ΔT =5.917 ºC. Find ΔE per mole for this hydrocarbon in kJ. 2. Using the technique of the previous problem ΔE was found to be -2,000.00 kJ/mol of an unknown liquid hydrocarbon at 298 K. In another experiment it was determined that for each mole of hydrocarbon, 8 moles of oxygen gas are consumed and 9 moles of CO2 gas and 7 moles of H2O liquid are produced. Find ΔH per mole of this hydrocarbon (in kJ) at 298 K.
Calculate the density in grams of propanol C3H8O if you know that there are 1.069×1025 molecules of propanol in 1.35 L
Get college assignment help at uniessay writers 4. An unknown compound contains carbon, hydrogen, oxygen, and sulfur atoms. When a 10.00 mg sample of the unknown compound was combusted, it produced 16.27 mg of CO2, 5.55 mg of water, and 7.90 mg of SO2. What is the empirical formula of the unknown compound?
calculate the work done when 50 g of tin dissolves in excess acid at 1 atm and 25 degrees celcius
A student placed 10.0 g of glucose (C6H12O6) n 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 of the flask was reached. The flask was then shaken until the solution was uniform. A 55.0mL sample of this glucose solution was diluted to 0.500L. How many grams of glucose are in 100. mL of the final solution?
The volume of an ideal gas in a container is 2.0L. What will the volume of the gas be if the pressure on the container is doubled while the temperature is reduced from 400k to 200k?
a sample of gas occupies 1.40 X 10 cubed mL at 25 degrees celcius and 760 mmHg. what volume will it occupy at the same temperature and 380 mmHg? which gas law is being used/
A 20.0- sample of 0.125 HNO3 is titrated with 0.150 NaOH. Calculate the for at least five different points throughout the titration curve and make a sketch of the curve.
How do you draw the lewis structures for: HOClO (HO)v2SO SOv4(-2) (SO4 with a negative 2 charge)
Cyclopropane, C3H6, is an anesthetic given by inhalation. How many grams are in 0.24 mol of cyclopropane?
The rate constant for a second order reaction is 0.650M. With initial concentration of reactant of 4.20 moles/Liter, how many mintues does it take for the concentration to drop 20% of its initial value?
Claculate the number of mL of 0.109 M NaOH that are required to rach the equivalence point in a KHP/NaOH titration in which 0.544 g of KHP are used.
Calculate the amount of heat liberated (in kJ) from 301 g of mercury when it cools from 61.0°C to 15.0°C.
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