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A hypothetical element, Z, has two stable isotopes. Z-38 = 38.012 u 75.68% Z-46 = 45.981 u 24.32% The element's atomic mass would be closest to which of the elements? K, Ar, Ca
Assuming Kf= 478Kg/s^2, calculate and compare the fraction of molecules in the first excited vibrational state at 1000K
Find the ratio of the rms speed of He to that of Xe at 30 degrees Celsius. Find the average kinetic energy per mole of He and Xe at 30 degrees Celsius. enter your answers in scientific notation.
A single-stranded RNA phage replicates in E. coli with no DNA intermediates. The following experiments were performed to clarify the phage's mode of replication.
At 0.0 C, if the volume of air is 2 mL and the pressure of the atmosphere that day is 665 mmHg, what is the number of moles of air?
Hydration of alkynes (via oxymercuration) gives good yields of single compounds only with symmetrical or terminal alkynes
the mechanism involved in the distillation of a mixture containing acetone and ethanol
600.0 ml of 0.240 m perchloric acid hclo4aq was added to a high quality constant-pressure calorimeter containing 400.0
Why shouldn't you use a sample that has been melted andresolidified to confirm a melting point? e) A sample of an unknown compound has an melting point of145-154C. What conclusions would you draw? What actions would youtake?
You need to make a diluted solution of HCl. Your concnetrated acid is 12M. How many L of the 12M HCL will you need to make 0.76 L of a 1 M HCL solution? Your answer must inlcude units
Calculate the corresponding entropy for each state. d) Calculate the temperature for each state.
Consider the reaction Br2(g) 2 Br(g), which is endothermic as written. What would be the effect on the equilibrium position of decreasing the temperature
Pure solid NaH2PO4 is dissolved in distilled water, making 100.0ml of solution. 10 ml of this solution is diluted to 100.00 ml to prepare the orignal phosphare standard solution.
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