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The diameter of a neutral helium atom is about 1x10 pm.suppose that we could line up helium atoms side by side in contact with one another. approximately how many atoms would it take to make the distance 1cm from end to end.
solid NaI is slowly added to a solution that is 0.010 M in Cu+ and 0.010 M in Ag+. which compound will begin to precipitate first?
lightbulb is visible light and that the average wavelength og the light is 550 nm, how many photons are emitted by the lightbuld each second?
Vitamin K is involved in the blood clotting mechanism. When 0.500 g is dissolved in 10.0 g of camphor, the freezing point is lowered by 4.43 °C. Calculate the molecular weight of vitamin K.
If aluminum is diffused into a thick slice of silicon with no previous aluminum in it at a temperature of 1100?C for 8 hours, what is the depth below the surface at which the concentration is 1016 atoms/cm3 if the surface concentration is maintain..
The repeating galacturonic acid monomers are connected by a-(1->4) bonds. Below draw 4 repeating monomer units making up a pectin molecule
Calculate the velocity of a nucleus given that it has 4 neutrons, 4 protons, a wavelength
Helium gas is heated at constant volume from a state of 100 kPa, 300 K to 500 K. A following process expands the gas at constant pressure to four times the initial volume.
A solution of a weak acid was tested with the indicators used in this experiment. The colors observed were as follows
Calculate the partial pressure of each gas. PHe = WebAssign will check your answer for the correct number of significant figures. atm PNe = WebAssign will check your answer for the correct number of significant figures
When 25mL of a 120mL stock solution containing 2M AlCl3 is diluted to 80mL, how many moles of Al3+ are in the new solution.
Tritium, 3H, undergoes beta decay with a decay constant of 5.63 x 10-2 yr-1. How much time is required for a 1.00 g sample of tritium to decay to 0.250 g
sodium acetate buffer before and after the addition of a) .0070 moles KOH and b) .0070 moles HBR a strong acid. Assume volume remains constant
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