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A 15.0 L sample of a gas has a mass of 18.0 g at 25.0 ° C and 740. torr. What is the density of the gas at STP?
Which compound requires a higher energy photon to cause a p to p* (HOMO/LUMO) transition,
DNA polymerase (DNA pol) requires divalent magnesium for activity. Alcohol dehydrogenase (ADH) requires nicotinamide adenine dinucleotide
A sample of gas has a density of 1.25 g/dm at 30 degrees C and 1.02x10^5 Pa. What is the molecular mas of this gas?
Identify the spectator ions present when the following are mixed. Include aggregation states. If there are no spectator ions, say none.
What molarity of aqueous magnesium chloride solution can be expected to show the same conductivity as 0.0075 M aluminum sulfate at 15,000 units.
The thallium (present as Tl2SO4) in a 6.05-g pesticide sample was precipitated as thallium(I)iodide. Calculate the mass percent of Tl2SO4 in the sample if 0.235g of TlI was recovered.
The partial pressure of the H2 is 1.9 atm, and the partial pressure of the Ne is 3.4 atm. What is the mole fraction of H2?
A dark glass bottle of chemicals is found in cleaning out an old basement. Part of the label has been eaten away with age. Only the last part of the label is readable
A solution made by dissolving 1.20 g of the unknown compound in 25.0 g of benzene had a freezing point of 4.7 degrees Celsius
Assign oxidation numbers to all the elements in each of the following compounds or polyatomic ions: a)N2O b)LiOH c)SbO2^- d)IO4^-
What is the hydronium-ion concentration of a 0.40 M solution of HCN (Ka= 4.9×10-10) at 25° C?
You are investigating the metabolism of glutamic acid in E coli, which enters the TCA cycle as a-Ketoglutarate following an initial transamination reaction.
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