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A sample of the Dead Sea Scrolls gives a ^14C decay rate of 731 disintergrations/h. A modern sample gives 920 disintergrations/h. Estimate the age of the Scrolls from these data.
A gas bottle contains .65 mol of gas at 730 Hg pressure. If the final pressure is 1.15 atm, how many moles of gas were added to the bottle?
using this equation N2(g)+3H2(g)-->2NH3(g) if 10500 L H2 gas is reacted with an excess of N2 gas at 200 atm and 500 degrees how many moles of ammonia gas would be produced, assuming a 15% yield
The fluorocarbon compound C2Cl3F3 has a normal boiling point of 47.6 C The specific heats of C2Cl3F3(l) and C2Cl3F3(g) are 0.91 J/g-K and 0.67 J/g-K, respectively.
A hypothetical element consists of two isotopes of masses 86.95 amu and 88.95 amu with abundances of 35.5% and 64.5%, respectively. What is the average atomic mass of this element?
Calculate the Q for the water in Joules (c for water is 4.184J/g degrees celsius). Determine the Q for the metal in Joules based on your knowledge of conservation of energy. (you cannot use the Q=mcdeltaT equation, because you do not know the c fo..
If 3.00 g of PbO2 was allowed to react with 2.00 g of Pb and 2.00 g of sulfuric acid, then 0.0116 mol of PbSO4 was obtained. What was the percent yield of PbSO4 (by weight) for this reaction?
Calculate the pH when 3.06 g of NaClO is added to 57.2 mL of 0.50 M HClO. Ignore any changes in volume.
When doing the kinetic trial, Peyton mistakenly omitted the starch solution from the kinetic trials. How will this omission change the appearance of the resultant solution (from mixing solutions A&B)
Compounds are always composed of two or more elements. Atoms of different elements are different. Isotopes have the same number of protons but a different number of neutrons.
In this experiment a hot metal block at 100oC is added to cold water in a calorimeter. The heat lost by the metal block equals the heat gained by the water and the two end up at the same temperature.
A graduated cylinder contains 133 of water. A 10.0 piece of iron (density = 7.86 ) and a 16.0 piece of lead are added. What is the new water level in the cylinder?
what can you conclude about the process of breaking bonds in the liquid as compared to the gas phase? Explain the difference in the heat of formation values between the two phases.
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