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The star Proxima Centuri is of apparent magnitude 11.05 and Absolute Magnitude +15.4. Select the correct answer for the distance to the star in parsec (pc)?
how many grams of zinc metal will react with 24.5 ml of 2.0 m hydrochloric acid hcl forming zinc chloride zncl2?
A saturated solution of PbF2 was making by dissolving solid PbF2 in water, the concentration was found to be 2.08x10-3 M define what is the Ksp
A uniformly charged thin ring has radius 14.5cm and total charge 23.0nC . An electron is placed on the ring's axis a distance 30.0cm from the center of the ring and is constrained to stay on the axis of the ring. The electron is then released from..
If the permeate stream is 50 mol% O2, and the reject stream is 13 mol% O2, what are the volumetric flow rates(L/min) of the two outlet streams
What is the driving force for the rearrangement of intermediate carbocations during the dehydration of alcohols
What mass (in grams) of solid sucrose (C12H22O11) would need to be added to 2000 grams of water to make an ideal solution with a boiling point of 102.9°C? (Kb for water is 0.512°C/m)
The white precipitate obtained when cold HCl was added to an unknown solution was completely insoluble in both hot water and NH4OH
Determine the mL KOH needed at the equivalence point and the ph upon the addition of this volume of KOH.
What is the wavelength (in meters) of photons with the following energies. In what region of the electromagnetic spectrum does each appear.
At 50°C the vapor pressure of ethanol is 0.30 atm, acetic acid is 0.08 atm, water is 0.12 atm, and acetone is 0.84 atm. A) Arrange these substances in order of increasing rates of evaporation.
A researcher studyng the nutritional value of a new candy places a 4.50 gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.68 C.
The hydration of norbornene and the bromination of trans-cinnamic acid are both examples of additions across a double bond. How many new stereocenters were generated in the hydration
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