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If 105 of fluorine-18 is shipped at 8:00 A.M., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 P.M. ?
What are the steps to calculate the following: How many grams of barium sulfate are produced if 25.34 mL of 0.113 M BaCl2 completely react given the reaction.
A corrosion technologist pipetted a 100.00 mL hard water sample and titrated it with 37.64 mL of 0.01 M EDTA solution for a total hardness endpoint, and 29.32 mL of 0.01 M EDTA solution for a calciu
a mass of 48.5 g of a certain substanse can be disolved in 29.1 cm3 of water at 20 degrees celcius. Calculate the solubility of this substance per gram of water at the same temperature.
Calculate the enthalpy of reaction, using standard enthalpies of formation. (ΔH?f for H2, C2H4, and C2H6 are 0, 52.3 kJ/mol, and -84.7 kJ/mol, respectively.)
How many moles of CO2 are produces when 5.55 mol of ethane are burned in an excess of oxygen.
How much energy (in kilojoules) is needed to heat 3.60 {rm g} of ice from -11.0^circ {rm C} to 30.5^circ {rm C}? The heat of fusion of water is 6.01{rm kJ/mol}.
How much ice in grams would have to melt to lower the temperature of 358 g of water from 40 degrees to 0 degrees? (Assume that the density of water is 1.0 (g/ml)
The pistonpushed into the cylinder reducing the volume inside the cylinder to 145 ml. At the same time the cylinder is heated to 75 degrees celsius. What is the resulting pressure in the system?
A corrosionist pipetted a 50.00 ml sample of an unknown brine and titrated it with 37.64 ml of 0.1024 M silver nitrate solution. Calculate the ppm of salt (NaCl)in the sample.
A 4.80 g nugget of pure gold absorbed 276 J of heat. What was the final temperature of the gold if the initial temperature was 26.0°C?
Discuss in detail the healthcare applications of chemical reactions. Which chemical reactions would you consider to be of importance to healthcare professionals?
Considering the different resonance structures that contribute to the resonance hybrid in this molecule, explain why this molecule has a larger bond angle than the isoelectronic methyl azide.
Starting with 3.00 moles of HBr in a 12.0 L reaction vessel, calculate the concentrations of H2, Br2, and HBr at equilibrium.
Calculate the uncertainty (in nm) in the position of an electron with the velocity of 2.00x103 m/s (the velocity is the same as in the preceding problem) and the uncertainty in the velocity is 1%.
At a certain temperature and pressure 1.4 L of N2 reacts with 2.1 L of O2. If all the N2 and O2 are consumed, what volume of N2O3, at the same temperature and pressure, will be produced?
The amount of alcohol you have. 3,3-diethyl-2-pentanol will be dehydrated to form alkenes. Give balanced equation and calculate the theoretical yield if you have 5.00mL of alcohol available.
Calculate the volume of concentrated acid required to prepare 1.00 liter of 5.20-molar H2SO4.
N2(g) + 3H2(g) ---->2NH3(g) is 1.7x 10^2. Is the reaction mixture at equllibrium? If not, what is the direction of the net reaction?
If 15.0g of a gas dissolves in 1.00 L of water at 110kPa,what mass will dissolve at 101.325kPa?The solubility of an unknown gas is 1.20 g/L at 1.00 atm. What is the solubility of the gas at 1.52 atm?
A gas is collected over water at a certain temperature. The total pressure is 762 torr. The vapor pressure of water at this temperature is 17 torr. what is the partial pressure of gas collected ?
Which of the following reaction mechanisms proceeds with inversion of configuration at a stereogenic center?
A saturated solution contains 167 g AgClO4 in 30 ml of water in 25 C. What is the solubility in g solute/(100 g H20)? Calculate the mole fraction of solute at this temperature.
A zero-order reaction has a constant rate of 3.50×10-4 . If after 40.0 seconds the concentration has dropped to 6.50×10-2, what was the initial concentration?