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Positron cannot penetrate matter more than a few atomic diameters, but positron emission of radiotracers can be monitored in medical diagnosis. Explain.
How do you calculate the molar enthalpy of barium nitrate in this situation: potassium nitrate a researcher adds a 261 g sample of barium nitrate to 2.0 L of potassium sulfate solution in a calorimete
The molar heat of combustion of methanol, CH3OH, is -757kJ/mol. If 2g of methanol is placed in bomb calorimeter with heat capacity of 6.5 kJ/c, what is the temperature rise when the sample is combus
calculate the minimum number of grams of propane,C3H8 , that must be combusted to provide the energy necessary to convert 5.00 kg of ice at -15.5 degrees Celsius to liquid water at 78.0 degrees Cels
The standard enthalpy change for the following reaction is 104 kJ at 298 K. C3H8 (g) 3 C(s,graphite) + 4 H2(g) ΔH° = 104 kJ What is the standard enthalpy change for the reaction 3 C(s,grap
What is the vapor pressure (in {rm mm Hg}) of a solution of 15.5g of glucose in 82.0g of methanol at 27 degrees C? The vapor pressure of pure methanol at 27 degrees C is 140 mm Hg.
A 0.456 gram sample of an unknown monoprotic acid (let's call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL o
At equilibrium the density of the gas mixture is 0.525 g/L at 0.755atm. calculate Kc for the reaction?
Consider the unbalanced equation above. How many grams of O2 are required to react with 13.0 g of C2H6? What mass of CO2 is produced?
How many grams of malonic acid would be needed to make 50.0 milliliters (0.0500 L) of 0.200 M malonic acid? The formula for maganese sulfate monohydrate is MnSO4 x H2O. What is its molar mass?
A graduated cylinder contains 138 of water. A 19.0 piece of iron (density = 7.86 ) and a 25.0 piece of lead are added. What is the new water level in the cylinder?
What is being asked? Using the values of the effective molar absorptivities you determined from your slopes and the values of the absorption you obtained for the mixture at the spectral maxima of 43
If the oven uses microwave radiation of wavelength 12.2 cm, how many photons of this radiation are required to heat 1.28 g of water 1.00°C, assuming that all the photons are absorbed?
How many kilojoules are required to raise the temperature of a 150. g sample of silver from 25 degree celcius to 135 degree celcius? silver has a specific heat of 0.235J/g degree celcius.
A 26.0-g sample of ice at -11.0°C is mixed with 123.0 g of water at 90.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H
Treatment of 4-chloro-1-butanol with one equivalent of lithium diisopropylamide (LDA) as a base leads to rapid formation of a compound with the molecular formula C4H8O.
The other uses an incorrect value (16) and determines the average molecular weight as 32.8. This is the only error in the calculation. What is the percent of oxygen in the mixture expressed as mole
How does direct current break apart water molecule? Does the DC current fill the outer shell full of electrons making a weaker attraction so hydrogen seperates from oxygen?
A sample of nitrogen gas is contained in a pistol with a freely moving cylinder. At 0.0 C , the volume of the gas is 375 ml. To what temperature must the gas be heated to occupy a volume of 500.0ml
An empty volumetric flask, weighing 60.42 grams, weighed 309.60 grams when filled with water. After emptying the water and drying the flask, it was filled with ethylene glycol. It now weighed 338.72
A total of 2.00 of a compound is allowed to react with water in a foam coffee cup and the reaction produces 193 of solution. The reaction caused the temperature of the solution to rise from 21.0 to
What fraction of A remains in the aqueous phase (a) if one extraction with 500 mL is performed and (b) if five extractions with 100 mL are performed?
A solution of sulphide Ct=10-6M is blended into a 0.4M sodium chloride solution in a closed container. Plot a pC-pH diagram for the system and include activity coefficients in the construction.