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There is a relatively constant amount of carbon-14 in living (breathing) things on Earth. Upon death of the plant or animal ,the amount of C14 in the organism decreases, according to the kinetics of first-order decay, A?products.Carbon dating is a technique used to estimate the age of the (dead) organic material by comparing its current C-14 radioactivity (in counts per minute per gram) in the sample with the value of the activity in living things (13.6cpm/g) which would have been the activity in the sample at the time of ‘death'. The radioactivity is directly proportional to the amount of C-14 nuclei in the sample.Thus we can replace our [A] in the first order equation with ‘activity 'in cpm/g. Instead of ln([A]/[A]0)=-kt, we can use ln(N/N0)=-kt, or, more precisely,Ln([activity] [activity]0)=-kt. If the activity is 13.6 cpm/g for living things, and the activity of a sample of remnants of anancient fire in a cave in Africais found to be 3.1 cpm/g, what is the estimate of the age of the remnants? C-14 has a half-life of 5730 years.Give your answer in years.
A gas occupying a volume of 263 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
a sample of nitrogen gas occupies 1.55 L at 27.0 C and 1.00 atm pressure. What will the volume be -100 C and the same pressure?
Calculate the pH of this buffer solution after the addition of 0.010 moles of solid sodium hydroxide to the buffer
process it is given that Rubidium has a heat of vaporization =69.0 kJ/mol at its boiling pt= (686°C). Compute ΔS for this process?
An industrial hygiene survey has been conducted to determine whether exposure of workers to ethyl benzene (molecular weight 106) exceeded the OSHA PEL of 100 ppm.
Find the temperature and the pressure of a gas inside the cylinder - what was the initial pressure of the gas in the cylinder?
how many moles of oxygen are consumed each time 0.500 mole of P2O5 is formed?
What is the mass, and the volume, of this seawater that contains 1.00 g of oxygen?
Draw the bondline structures of the isomers of this compound in the manner requested: Its diastereomer C, its optically active isomer D.
How many grams of chromium would be electroplated by passing a constant current of 5.2 amperes through a solution containing chromium(III) sulfate for 45.0 minutes.
According to Avogadro's law, how many liters of hydrogen are required to react with 1.9L of oxygen at STP.
calculate the molality of a solution prepared by dissolving 19.9 grams of KCl in 750.0 mL of water
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