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Assume that the global amount of radio-carbon (C14 formed by cosmic-ray bombardment in the upper atmosphere and then dissolved in rain and seawater) is constant. Then during their lives, all organisms constantly replace C14 by respiration and drinking water. However, when the organism dies, the amount of C14 in the organism decreases as it decays to N14.
a) The carbon in the buried peat bed has about 3.5% of the C14 of modern sea shells. What is the age of the peat bed? Refer to the graph and Table 8.1 (Attached). Explain answers.
b) In sampling the peat bed, you must be careful to avoid any young plant roots of other material that might contain radio-carbon. Why?
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Assume that a particular reaction evolves 250 kj of heat and that 34 kj of PV work is gained by the system. What is the enthalpy?
at combustion temperatures the equilibrium constant for thereaction of n2 with o2 is about 10-14. calculate
An empty beaker has a mass of 42.889 g. 10.00 mL of NaCl solution are placed in the beaker. The mass of the beaker and solutionis 54.129 g.
Write a balanced equation for the conversion of C6H5CHOHCH3 to the methyl ketone in the presence of I2 and NAOH
How long will it take 10.0 mL of oxygen gas to effuse through a porous barrier if it has been observed that 81.7 minutes are required for 10.0 mL of Cl2 gas to effuse through the same barrier?
Under these conditions, how many grams of NH3 (MW = 17.0 g/mol) will be produced from the reaction of 25.0 g N2 (MW = 28.0 g/mol) with 2.00 g H2?
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The density of silver is 10.5 g/mL. What is the mass (in grams) of a piece of silver with a volume of 23.6 mL
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what must be the molarity of an acetic acid solution if it has thesame percent ionization as 0.100 mhc3h5o2 propionic
Problem- A student was asked to separate two substances, A and B, on a 30 cm column. She obtained a chromatogram that gave retention times of 15.80 and 17.23 min for A and B, respectively. The base peak widths for A and B were 1.25 and 1.38 min, r..
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