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In 1998 archaeologist uncover a wooden coffin believed by local residents to be that of early american colonist. A piece of the coffin is analyzed by radiocarbon dating to determine the actual age of the coffin. The decay rate for carbon 14 in the sample is 14.2 dis/min per graham carbon. In what year was the coffin most likely made? ( Assume the half life of carbon-14 is 5730 years and that the decay rate for carbon 14 in living organisms is 15 dis/min per gram carbon
The reaction caused the temperature of the solution to rise from 21.10 °C to 25.46 °C. If the solution has the same density and specific heat as water, what is Î"H for this reaction (per mole of H2O produced)?
Half-life equation for first-order reactions: (the 1/2 in t1/2 is a subscript) t1/2=0.693/k where t1/2 is the half-life in seconds (s) , and k is the rate constant in inverse seconds (s^-1).
Determine the mass of sodium phosphate that yields 1.00 g of calcium phosphate precipitate.
Nitrogen and oxygen gases react to form dinitrogen trioxide gas. 2 N2(g) + 3 O2(g) -> 2 N2O3(g) At a certain temperature and pressure 4.2 L of N2 reacts with 6.3 L of O2.
When you heated the hydrated compound this process starts slowly at first find out the reason behind this and compute k for this acid if A 0.020 M solution of weak acid HA is 0.60% ionized.
A sample of 54.7 g of HCl gas is dissolved to make 1L of solution. What is the molarity of the solution?
How many moles contain each of the following? 3.75 x 10^24 molecules CO2
How many grams of ice at 0°C and 101.3kPa could be melted by the addition of 0.40kJ of heat? Find the molar heat of fusion.
At a temperature of 435C and a pressure of 715 mmHg, how many grams of NH3 can be produced when 4.50 L of NO2 react?
The molar solubility of MnCO3 is 4.2 x 10-6 M. What is Ksp for this compound?
A piston has an external pressure of 11.0 atm . How much work has been done if the cylinder goes from a volume of 0.150 liters to 0.620 liters.
From the Mn concentrations (3.56ppm and 3.71ppm) and uncertainty
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