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Problem- A researcher claims that an ancient scroll originated from Greek scholars in about 500 b.c. A measure of its carbon-14 decay rate gives a value that is 92 % of that found in living organisms.
How old is the scroll? (The half-life of carbon-14 is 5730 yr)
Express your answer to two significant figures and include the appropriate units.
When 5.00 g of fructose, C6H12O6, (FW 180.16 g/mol) is burned in a calorimeter whose heat capacity is 29.7 kJ/oK, the temperature increases by 2.635oK. Calculate the heat of combustion of fructose in kJ per mole.
The main reason that alkyl halies are good electrophiles is that: A) the carbon atom linked to the halogen is negatively polarized. B) the carbon atom linked to the halogen is positively polarized
What would be potential of a battery formed by perchlorate/chlorate ion pair
in the titration of 63.0 ml of 1.0 m methylamine ch3nh2 kb 4.4 multiplied by 10-4 with 0.50 m hcl calculate the ph
Calculate the vapor pressure of water, in torr, above a solution prepared by dissolving 65.40 g of ZnCl2 in 445.0 g of water at 323.0 K. The vapor pressure of pure water at 323.0 K is 92.50 torr.
Explain your reasoning for each by writing a balanced net ionic equation to describe its behavior in water.
Gallium crystallizes in a primitive cubic unit cell. The length of an edge of this cube is 362 pm . What is the radius of a gallium atom
How many photons strike the CD surface during the playing of a CD 69 minutes in length?
During the fermentation of wine, a buffer system consisting of tartaric acid and potassium tartrate is formed by a biochemical reaction.
The vapor pressure of an unknown compound at 25 degrees C is 94.6 Torr and its enthalpy of vaporization is 30811 J/mol. Estimate the normal boiling point of this compound. assume the enthalpy of vaporization is independent of temperature.
If a certain reaction has a rate constant of 9.51x10-9 L mol -1 s-1 at 500K as well as a rate constant of 1.10z10-5 L mol -1 s-1 at 600K, Explain what is the value of Ea
If 0.1800 g of impure soda ash (Na2CO3) is titrated with 15.66 mL of 0.1082 M HCl, what is the percent purity of the soda ash. Na2CO3(aq) + 2 HCl(aq) ? 2 NaCl(aq) + H2O(mc048-1.jpg) + CO2(g)
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