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Get college assignment help at uniessay writers If 80.0 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. ?

Calculate the heat evolved per mole on combustion of each substance

Calculate the heat evolved per mole on combustion of each substance to yield {rm CO_2}(g) and {rm H_2O}(g).

1. How many moles of oxygen are in 4.59 mol of

1. How many moles of oxygen are in 4.59 mol of KMnO4? 2. What is the mass of 8.65 x 10^25 atoms of Hydrogen? 3. How many particles are in 0.425 mol of Hg?

If 103000 L H2 gas is reacted with an excess of

If 103000 L H2 gas is reacted with an excess of N2 gas at 200. atm and 500. degrees Celsius, how many moles of ammonia gas would be produced, assuming 15% yield?

a reseacher has a 100.0 mL solution that is 0.491 M

a reseacher has a 100.0 mL solution that is 0.491 M in Hg2(No3)2 and 0.0294 M in Pb(N03)2. She plans to add solid potassium iodide to separate the mixture by selective precipitation. Ksp PbI2=1.4e-8, Ksp Hg2I2= 1.2e-28 What is the maximum concentration of iodide ions that may be in solution to achieve the best separation possible? How many grams of potassium iodide should she add to achieve this? What will the percentage of mercury (I) ions remaining in solution be?

an adult person radiates heat to the surroundings at about the

an adult person radiates heat to the surroundings at about the same as a 100-watt electric incandescent lightbulb. what is the total amount of energy in kcal radiated to the surroundings by an adult in 24 hours?

At an altitude of 30 km, the temperature in the stratosphere

At an altitude of 30 km, the temperature in the stratosphere is approx. -45.3 degrees F. What is the average kinetic energy of a single CF2Cl2 molecule at this temperature?

Why is it important to use lambda max (measured from spectroscope)?

Why is it important to use lambda max (measured from spectroscope)? What I am unclear about is why it is important to know it before creating a standard curve? This is for a Absorbence of light vs. concentration experiment.

What is the de Broglie wavelength (in meters) of a mosquito

What is the de Broglie wavelength (in meters) of a mosquito weighing 1.50 mg and flying at 1.34 m/s?

NaHCO3(s) HCl–>NaCl(aq) CO2(g) H2O(l) 100 mL of 3M HCl is spilled on a lab

NaHCO3(s) HCl–>NaCl(aq) CO2(g) H2O(l) 100 mL of 3M HCl is spilled on a lab bench, what is the minimum mass of sodium bicarbonate that muct be used to neutralize the acid?

A tank is first evacuated, and then connected to a 75.0

Get college assignment help at uniessay writers A tank is first evacuated, and then connected to a 75.0 L cylinder of compressed nitrogen gas. The gas pressure in the cylinder, originally at 15.8 atm, falls to 1.05 atm without a change in temperature. What is the volume of the tank?

Identify the mechanism by which each of the reactions above proceeds

Identify the mechanism by which each of the reactions above proceeds from among the mechanisms listed. Use the letters a – i for your answers.

What pressure will 2.6 x 1023 molecules of H2 exert in

What pressure will 2.6 x 1023 molecules of H2 exert in a 3.9 L container at 45°C?

Place the following ions in order from smallest to largest ionic

Place the following ions in order from smallest to largest ionic radii: P3-, K , Na , and Cl-.

1.25 M solution of chlorous acid, HClO2, is 9.2% dissociated. What

1.25 M solution of chlorous acid, HClO2, is 9.2% dissociated. What is the pH of this solution

a solution that is 6.5×10−2 in potassium propionate ( or )

a solution that is 6.5×10−2 in potassium propionate ( or ) and 8.5×10−2 in propionic acid ( or ) Use information from Appendix D in the textbook to calculate the of the following solutions.

8) A 25.0 mL sample of 0.10 M sodium acetate is

8) A 25.0 mL sample of 0.10 M sodium acetate is titrated with 0.10 M HCl(aq). What is the pH after the addition of 35.0 mL of HCl(aq)? (Kb of CH3CO2- = 5.6  10-10)

3.5 g of a hydrocarbon fuel is burned in a vessel

3.5 g of a hydrocarbon fuel is burned in a vessel that contains 250. grams of water initially at 25.00 C. After the combustion, the temperature of the water is 26.55 C. How much heat is evolved per gram of fuel burned? HW13: Thermodynamics I Padilla (tp5647) 1. 73.5 J/g 2. 1263 J/g 3. 463 J/g 4. 143 J/g 5. 1105 J/g 6. 1764 J/g 7. 26555 J/g 8. 511 J/g

A 10.20-mL sample of sulfuric acid from an automobile battery requires

A 10.20-mL sample of sulfuric acid from an automobile battery requires 35.99-mL of 2.33 M sodium hydroxide solution for complete neutralization. What is the molarity of the sulfuric acid? Sulfuric acid contains two acidic hydrogens.

1. Which of the following statements about entropy is untrue? a)

1. Which of the following statements about entropy is untrue? a) The change in the entropy of the universe for a given process is a measure of the driving force behind that process. b) An increase in entropy explains why an endothermic process might be spontaneous. c) The entropy of a system always increases d) Entropy is a measure of how energy is distributed amongst the particles of a system into different energy levels. 2. If a system consists of two subsystems, one with 5 microstates and one with 10 microstates, how many microstates are in the whole system? 3. The more steps taken in expanding an ideal gas, the more work gets done by the surroundings on the system. (True or False)

what is the net ionic equation of sodium bromide and rubidium

what is the net ionic equation of sodium bromide and rubidium chloride

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