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Question- An archaeologist discovers a fossil with a carbon-14 activity of 7.5 dpm per gram of carbon. If carbon-14 has an activity of 15.3 dpm, what is the estimated age of the fossil? (t1/2 = 5730 years)
Express your knowledge to solve the above question
Suppose that a fully charged lead-acid battery contains 1.50 of 5.00 . What will be the concentration of in the battery after 2.50 of current is drawn from the battery for 8.50
What is the maximum mass of water that can be released by heating a 8.904 g sample of nickel(II) sulfate heptahydrate?
A 5.30 sample of gold is heated from 20.0 c to 35.0 c as well as absorbs 2.07 j of heat. Find out the specific heat of gold.
What volume of antifreeze (C2H4(OH)2 MW= 62.068 g/mol and density of 1.1132 g/ml) and what volume of water must be mixed together in order to have a total volume of solution that is 7.00 L and which will not freeze until the temperature drops belo..
A single atom of an unknown element travels at 15% the speed of light. The de Broglie wavelength of the atom is 1.06x10^-16m. What element is this
Most of the product is formed by anSN2 reaction. Give a mechanism for the reaction showing the transition state and explain why it leads to inversion of the configuration and give a perspective formula and a name of the main product of this reacti..
If you fill the larger tank with oxygen to a pressure of 135 atm, to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
What product is formed when 5-chloro-1-methylcyclohexene is reduced with a Pt catalyst and H2? a) 1-chloro-5-methylcyclohexane b) 1-chloro-3-methylcyclohexane c) 5-chloro-1-methylcyclohexane d) 3-chloro-1-methylcyclohexane e) None of the above
Europium is a lanthanide element found in parts per billion levels in natural waters. It can be measured from the intensity of orange light emitted when a solution is illuminated with ultraviolet radiation.
If, at a given temperature, the equilibrium constant for the reaction H2(g) + Cl2(g) 2HCl(g) is ?6.0, then the equilibrium constant for the reaction HCl(g)
Consider a lake containing 39 ppb (parts per billion) of parathion, which has a log Kow = 3.8. If a sample of lake water was mixed with octanol, what is the expected concentration of parathion in the octanol?
1. Calculate the pH after 0.0 mL of KOH has been added. 2. Calculate the pH after 10.0 mL of KOH has been added. 3. Calculate the pH after 25.0 mL of KOH has been added. 4. Calculate the pH at the equivalence point. 5. Calculate the pH after 150.0..
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