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A radiometric dating technique uses the decay of U-238 to Pb-206 (the half-life for this process is 4.5 billion years) to determine the age of the oldest rocks on Earth and by implication the age of Earth itself. The oldest uranium-containing rocks on Earth contain approximately equal numbers of uranium atoms and lead atoms. Assuming the rocks were pure uranium when they were formed, how old are the rocks?
what is the enthalpy change for a reaction where the internal energy change is 58.0 kJ and the volume increase is 12.6 L? (1L * atm = 101.325 J)
Calculate the molarity of a solution made by adding 44.4 mL of concentrated ammonia (28% by mass, density 0.880 g/mL) to some water to some water in a volumetric flask
If 10.0 L of carbon dioxide gas at STP and 50.0g of sodium chloride react with excess ammonia and water, what is the limiting reactant and the mass of baking soda produced
What is the minimum temperature required to convert all but 0.040 of to products by 4:00 p.m.?
Calculate the pH of the solution that is 0.600 M CH3NH2 and 0.500 M CH3NH3Cl. (Kb for CH3NH2 = 4.38 x 10-4)
How do I show all steps and their respective manipulations to obtain the correct equation and determine the ΔH in kJ for the reaction of 2 Mg (s) + O2 (g) ----> 2MgO (s)
The CO2 was collected and its pressure found to be 25.2kPa in the same volume and at the same temperature as the original mixture. What % of original mixture was methane
Calculate thePH at the equivalence point in titrating 0.100 M solutions of each of the following with 9.0×10? HCLO2
a certain monomer used in the production of polymers has one nitrogen atom and the mass composition 67.90 c 5.70 h and
Identify the element oxidized and reduced in the following redox rxn. Also indicated the number of electrons lost/gained by each atom.
Gold (III) oxide, Au2O3, undergoes a thermal decomposition reaction to form gold metal and oxygen gas. Write a balanced molecular
At what temperature is the molar volume of an ideal gas equal to 22.4L, if the pressure of the gas is 2.5 atm
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