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Compute the energy in joules needed to ionize a hydrogen atom when its electron is initially in the n = 6 energy level. (Is the energy greater than or less than the +2.18 x 10^-18 J needed to ionize a ground-state hydrogen atom?).
What total volume of a 2.25M sodium chloride aqueous solution contains 0.45 moles of sodium chloride ? *1.0 L *2.3 L * 0.20 L *0.020 L *0.045 L
calculate the expected change in temperature for 4.5 g of NH4NO3 dissolved in 100.0 mL of H20. Assume that the calorimeter absorbs no heat. (ie. Ccal=0)
if 2.15 g of an unknown solid nonelectrplyte is dissolved in18.1 g of naphthalene the resulting solution is
A compound has the empirical formula CHCl. (Note: the last element is chlorine.) A 256.0mL flask, at 373K and 750mmHg, contains 0.80g of the gaseous compound. Find the molecular formula of the compound
(a) how many protein molecules do you find in the average eukaryotic cell and prokaryotic cell? (b). What is the ratio of protein found within a human heart compared to the prokaryotic cells inhabiting human intestines?
Is there a correlation between the position of a metal ion in the periodic table and the colour (or lack of colour) of the ion in solution. Explain
Calculate the maximum number of moles and grams of H2S that can form when 195 g aluminum sulfide reacts with 106 g water.
A serum sample of a concentration of 23.0 ppm. How many mL of 0.010M EDTA solution would be added to 100 mL of serum sample to get to a final
calamine lotion contains a mixture of both zinc and iron oxides. a 1.022 g sample of dried calamine was dissolved in
How many milliliters of 0.200 M NaOH are needed to neutralize 100. mL of 0.100 M HCl
A 11.0-L helium tank is pressurized to 26.0 atm. When connected to this tank, a balloon will inflate because the pressure inside the tank is greater than the atmospheric pressure pushing on the outside of the balloon.
Liquid nitrogen trichloride is heated in a 2.50-L closed reaction vessel until it decomposes completely to gaseous elements. The resulting mixture exerts a pressure of 754 mmHg at 95 0C. What is the mass of the original sample.
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