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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.
if adding 62.0 calories to an aluminum block causes the temperature of the aluminum to increase from 62*F to 89*F, what is the mass in grams of the aluminum block
When 31.7mL of 0.235M Potassium hydroxide is required to completely neutralize 26.0mL of a HC 2 H 3 O 2 solution, calculate the molarity of the acetic acid solution.
What is the pH at the point during a titration when 34 mL of 0.200 M HCl has been added to 33 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10-5 for NH3.
Solid sodium peroxide (Na2O2) reacts with liquid water yielding aqueous sodium hydroxide and oxygen gas. How much heat is released
If the methane contained in 3.00 L of a saturated solution at 25 was extracted and placed under STP conditions, what volume would it occupy.
What mass of carbon dioxide is produced from the complete combustion of 7.50×10^-3g of methane?
How many molecules of carbon dioxide are produced when 129 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water.
You are a hazmat responder and walk into what appears to be a meth lab. There are flasks of iodine, White Gas fuel, Sodium Hydroxide, Nitric Acid, and a box of ephidrine.
If the partial pressure of NO is decreasing at the rate of 32 torr/min, what is the rate of change of the total pressure of the vessel?
calculate the freezing point of a nonionizing antifreeze solution containing 388 g ethylene glycol, C2H6O2 and 409 g of water.
Find the pH of a 0.130 M solution of a weak monoprotic acid with a Ka value of 1.6 *10(to the power of -6)
How many grams of CH4 is needed to produce 49.0 g CHCl3? CH4(g) + 3 Cl2(g)-> CHCl3(g) + 3 HCl(g)
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