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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 15 g of KClO3 are added to 200 g of water at 25 degrees celsius with stirring, how much of the KClO3 will dissolve?
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?
What is the vapor pressure (in mm Hg}) of a solution of 15.5g of glucose in 82.0g of methanol at 27 degrees C? The vapor pressure of pure methanol at 27 degrees C is 140 mm Hg.
how many moles O2 of are present? (The mole fraction of in dry air is 0.2095.) How many grams of C8H18 could be combusted by this quantity of O2
95.0 mL of H_2O is initially at room temperature (22 C). A chilled steel rod at 2 C is placed in the water. If the final temperature of the system is 21.4 C, what is the mass of the steel bar?
A 460 mL sample of oxygen (O2) was collected by displacement of water at 24 ? C under a total barometric pressure of 1095 torr. What mass of dry oxygen was collected? The vapor pressure of water at 24 ? C is 22 torr
Identify the oxidation-reduction reactions among the following: 1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
If the temperature of a sample of gas with an initial volume of 1.75 is increased form 15.0 c to 30.0c, what will the final volume be.
A balloon has a volume of 1.75L at a temperature of 25°C. What will be the volume of the balloon if you take it out into the winter cold air at -15°C?
How many grams of oxygen are collected in a reaction where 265 mL of oxygen gas is collected over water at a temperature of 298 K and a total pressure of 709 torr
At 373 K, Keq = 2.39 for the following reaction: SO2Cl2(g) = SO2(g) + Cl2(g) In an equilibrium mixture of the three gases, the partial pressures of SO2Cl2 and SO2 are 3.31 atm and 1.59 atm, respectively.
how many liters of fluoridated drinking water would a 70 kg person have to consume in one day to reach this toxic level? How many kg of sodium floride would be needed to treat a 7.49x10^6 -gal reservior?
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