Question

In: Chemistry

Problem 1. Prior to the Industrial Revolution, the C14/C12 ratio in the (Carbon dioxide in the)...

Problem 1. Prior to the Industrial Revolution, the C14/C12 ratio in the (Carbon dioxide in the) atmosphere was 1.5 e-12. Atmospheric C14 is continually produced by cosmic rays in the upper atmosphere. C14 is radioactive and decays into N14 with a half-life of 5,730 years. A sample of charred wood found in the remains of a settlement in Pennsylvania is measured to have a C14/C12 ratio equal to 0.9 e-12 with an accuracy of ±10%. Estimate the age of the wood. What accuracy is required to estimate the age ±25 years?

Expert Solution

Accuracy of +/- 10%

Hence the concentration can vary from (0.81 * 10^(-12) to 0.99 * 10^(-12) )

Age of wood if conc = 0.81 * 10^(-12)

Age of wood if conc = 0.99 * 10^(-12)

Age of wood if conc = 0.9 * 10^(-12)

For accuracy within +/- 25 years

4197.81 to 4247.81

Accuracy =

queen_honey_blossom answered 2 years ago

What has been the trend in global carbon dioxide emissions since the Industrial Revolution?

If the mixing ratio of carbon dioxide is 404 ppmv and the number density of air...

If the mixing ratio of carbon dioxide is 404 ppmv and the number density of air is 2.69x1025 molecules m-3, determine the mass density. Question 24 options: show work 8 x 10-4 kg m-3 4.7 x 10-3 kg m-3 0.18 ppm 793 kg m-3

12.2 Compression of Carbon Dioxide Carbon dioxide (CO2) at 1 bar and 300 K enters a...

12.2 Compression of Carbon Dioxide Carbon dioxide (CO2) at 1 bar and 300 K enters a compressor operating at steady state and is compressed adiabatically to an exit state of 10 bar and 520 K. The CO2 is modelled as an ideal gas, and the KE and PE effects are negligible. For the compressor, determine a) Work input [kJ/kg] b) Rate of entropy production [kJ/kg?K] c) The isentropic compressor efficiency d) T-s diagram of isentropic and real process

What is industrial revolution, political revolution, scientific revolution and french revolution?

Problem 1: Carbon dioxide flows isentropically at the rate of 1 kg/s through a convergent-divergent nozzle....

Problem 1: Carbon dioxide flows isentropically at the rate of 1 kg/s through a convergent-divergent nozzle. The stagnation temperature is 310 K and the stagnation pressure is 1400 kPa. If the exit pressure is 101.3 kPa, determine a) throat area, b) exit Mach number and c) exit velocity. Assume sonic (M =1) conditions at throat. (d) plot using MS excel variation of: total temperature, total pressure, total density, density, temperature, Mach number, velocity, speed of sound along the centre line...

Plants require carbon dioxide for photosynthesis; despite this, the greater the amount of carbon dioxide released...

Plants require carbon dioxide for photosynthesis; despite this, the greater the amount of carbon dioxide released into the atmosphere by various sources (including carbon emissions from vehicles), the worse it is for our biosphere. Discuss 3 reasons why it is detrimental to our planet to have high levels of carbon dioxide emitted continuously into the atmosphere.

Consider the problem of carbon dioxide emissions. We will abstract away from the problem slightly, assuming...

Consider the problem of carbon dioxide emissions. We will abstract away from the problem slightly, assuming there are pollutions and consumer in two regions, the OECD (O) and the rest of the world (R). Suppose the marginal cost of controlling CO2 emissions is $10 per ton of emissions. Let the marginal willingness to pay for pollution reduction be 13-Q for region O and 12-2Q for region R, where Q is the amount of pollution reduction. The United Nations is considering...

Recommendations on the fourth industrial revolution,

Problem 10.67 A piece of solid carbon dioxide with a mass of 5.70 g is placed...

Problem 10.67 A piece of solid carbon dioxide with a mass of 5.70 g is placed in a 10.0-L vessel that already contains air at 715 torr and 22 ∘C . Part A After the carbon dioxide has totally vaporized, what is the partial pressure of carbon dioxide in the container at 22 ∘C ? SubmitMy AnswersGive Up Incorrect; Try Again Part B After the carbon dioxide has totally vaporized, what is the total pressure in the container at 22...

Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the...

Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the following equation: CO2(s)→CO2(g). When dry ice is added to warm water, heat from the water causes the dry ice to sublime more quickly. The evaporating carbon dioxide produces a dense fog often used to create special effects. In a simple dry ice fog machine, dry ice is added to warm water in a Styrofoam cooler. The dry ice produces fog until it evaporates away,...