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Explain while exploring a coal mine, scientists found plant fossils in the ceiling of the preserved by an earthquake. Samples taken from one of the fossils have carbon-14 activities of 40.0 counts/min. A reference sample of the same size from a plant alive today has a carbon-14 activity of 160.0 counts/min. If carbon-14 has a half-life of 5730 years and what is the age of the plant fossil in years?
explain the apparent paradox. although the addition of one equivalent of HX to an alkyne is more exothermic than the addition of HX to an alkene, an alkene reacts faster
When a 4.25-g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 degree C to 16.9 degree C.
If two aqueous hydrogen bromide solutions containing 6.00 wt% HBr (SG = 1.0402) and 60.0 wt% HBr (SG = 1.6731) are mixed to form a 3.54 molar HBr solution (SG = 1.1935).
calculate the molar mass of naphthalene given that a solution of 2.11g of naphthalene in 100g of benzene has a
what is the effect of a temperature change on a chemical reaction initially at equilibrium? how does the effect differ
The barometric formula relates the pressure of a gas of molar mass M at an altitude h to its pressure Po at sea level. Derive this relation by showing that the change in pressure dp for an infinitesimal change in altitude dh where the density is P..
Explain how many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4. Reaction: 3Ca(NO3)2 + 2Li3PO4 --> 6LiNO3 + Ca3(PO4)2
At equilibrium the concentration of CO (g) was found to be 0.046 M. Calculate the equilibrium constant for the reaction equation at 527 degrees celcius.
A solution is made by diluting 235 mL of 0.120 M Fe(NO3)3 solution with water to a final volume of 0.500 L. Calculate. The molarities of Fe(NO3)3, Fe3+, and NO3- in the diluted solution.
If you have 410.0 mL of water at 25.00 °C and add 140.0 mL of water at 95.00 °C, what is the final temperature of the mixture. Use 1.00 g/mL as the density of water.
15.73 grams of a solution containing 8.43% acetic acid, HC2H3O2, is mixed with water and titrated with a 0.523 M solution of KOH. How many milliliters of the KOH solution are required to reach the equivalence point?
When the concentration of Zn2+ ion is 0.45 M, the measured voltage of the Zn-Cu zell is 0.40 V. What is the Cu2+ ion concentration
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