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Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.50 that of new wood. How old is the charcoal? (The half life of carbon-14 is 5,730 years.)
A. 5.7E3 years
B. 1.1E4 years
C.4.5E-3 years
D. 1.1E4 years
E. 5.7E3 years
2.00 L of H2 at a pressure of 398 torr and 1.00 L of N2 at an unknown pressure. If the total pressure in the flasks is 331 torr after the stopcock is opened,
What is the minimum flowrate (in m3 hr-1) needed to maintain a maximum CO concentration of 1 ppm in the room at steady-state? (b) What is the residence time of air in the room?
How do you arrange PV=nRT to give equation relating pressure to concentration and use it to modify Beer's Law to apply to gas pressure? Write a formula that relates absorbance to gas pressure.
Calcium hydroxide and sulfuric acid can react to produce calcium bisulfate and water. When 0.0720 mol of sulfuric acid are reacted with 0.0240 mol of calcium hydroxide, how much calcium bisulfate, Ca(HSO4)2, will be produced?
An empty beaker has a mass of 38.112 g. 10.00 mL of ethyl alcohol are placed in thte beaker and the mass of the beaker with ethanol is found to be 45.268 g
how to find the molar concentration of a soloution of phosphoric acid if 17.8 mL of it neutralizes 20.0 mL of 0.050 mol/L calcium hydroxide.
Calculate the potential of the cell be if the mass of the Iron (Fe) electrode (MW = 55.85 g/mol) is 62.0 g?
Assuming that the copper and lead are pure, determine the relative amounts of each kind of BB. A bag contains a mixture of copper and lead BBs
what is the volume of HCl gas required to react with excess magnesium metal to produce 6.82 L of Hydrogen gas at 2.19 atm and 308 K?
Which of the following buffers will have the lowest pH?
A sample containing .221g Cl is dissolved in 50.0mL of water. How many moles of Cl ion are in the solution?
You have 250.0 ml of 4.00 M sugar solution. You add 217.3 ml of water to this solution. Determine the concentration of the sugar solution after the water has been added
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