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A balloon is filled with helium to a volume of 1.05 x 10^3 L on the ground, where the pressure is 745 mm Hg and the temperature is 20. °C. When the balloon ascends to a height of 2 miles, where the pressure is only 600. mm Hg and the temperature is -33 °C, what is the volume of the helium in the balloon?
A fluoridated water supply contains F- at a concentration of 8.9 ppm. What is the maximum concentration of Mg2+ that can exist in this water supply without causing precipitation? The Ksp for MgF2 is 6.4×10-9. Answer in units of grams/L.
What are the three major buffer systems of the body and what are the chemical equations
Fe3O4 reacts with CO according to the reaction Fe3O4(s) + 4CO(g) --> 4CO2(g) + 3Fe(s). If 201 grams of Fe3O4 is reacted with excess CO, what mass of CO2 will be produced?
An analysis of nicotine (MW=162 g/mol) gives 74.0% carbon, 8.65% hydrogen, and 17.3 nitrogen. What is the true Molecular formula for nicotine?
At 25oC, the acid dissociation constant for hypochlorous acid HOCl is 3.5E-8. Calculate the concentration of the hydronium ion in an aqueous solution of 0.30M HOCl.
Half-life equation for first-order reactions: (the 1/2 in t1/2 is a subscript) t1/2=0.693/k where t1/2 is the half-life in seconds (s) , and k is the rate constant in inverse seconds (s^-1).
write mechanisms for the following reactions, which are used in chemical tests and derivative preparations: (a) the reaction of butanal with 2,4 dinitrophenylhydrazine reagent.
Ethane, C2H6, has a molar heat of vaporization of 15 kJ/mole. How many kilojoules or energy are required to vaporize 5 g of ethane?
Determine the hydraulic conductivity and transmissivity of the aquifer and What would Q be if the hydraulic gradient
calculate the osmotic pressure in torr of 6.00 L of an aqueous 0.889 m solution at 30.°c, if the solute concerned is totally ionized into three ions.
Consider the following reactions and select the false statement below. CO2(g) + OH?(aq) ? HCO3?(aq) Cr3+(aq) + 6H2O(l) ? Cr(H2O)63+(aq) A. in Cr(H2O)63+ the Cr3+ is attracted to the H2O molecules via ion-dipole intermolecular forces
How many calories are required to raise the temperature of 125.0g of water from 50.0 degrees c to 95.0 degrees c?
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