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A star is estimated to have a mass of 2x10 to 36 kg. Assuming it to be a sphere of average radius 7.0x 10 to 5 km, calculate the average density of the star in units of grams per cubic centimeter.
using equations explain how a buffer functions. buffers consist of a solution of a weak acid ha and its conjugate base
A (n) 8.54 - mol sample of carbon monoxide was stored in a 30.0-l container at 49.9 c . What is the pressure of the carbon monixide in the container.
How many grams of urea must be added to 88 milliliters of water in order to obtain a solution with a mole fraction of 0.012 in urea
Which of the following transitions in a hydrogen atom would emit the highest energy photon? a) n=1 to n=2 b) n=3 to n=2 c) n=5 to n=1 d) n=2 to n=8 e) n=6 to n=5
Suppose that 27 g of each of the following substances is initially at 29.0 C. What is the final temperature of each substance upon absorbing 2.45 kJ of heat?
write a balanced equation for the reaction that occurs between the solutes. Calculate the concentration of each remaining ion in solution. Is the resultant solution acidic or basic
Concentrated HF, molar mass 20.01 g/mol, comes into the lab as a 49.0% solution with a density of 1.18 g/ml. What is it's molarity
What volume of oxygen is required to burn completely 401 cm3 (centimeters cubed) of butane, C4H10 (All substances are gases measured at the same temperature and pressure.)
The compound As2I4 is synthesized by reaction of arsenic metal with arsenic triiodide. If a solid cubic block of arsenic (d 5.72 g/cm3) that is 3.03 cm on edge is allowed to react
Restricting yourself to straight-chain (unbranched) compounds, draw the structures of the possible constitutional isomers of pentene. There are two "variables" -- the position of the double bond; and cis/trans isomerization at that double bond.
How many moles of methane occupy a volume of 2000 mL at 50 degrees Celcius and 746 torr
a solution is made by dissolving 1.00 moles of sodium chloride nacl in 155 grams of water. if the molal boiling point
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