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What volume of 0.855 M KOH solutionis required to make 3.55 L of a solution with pH of 12.4?
A 70.6 L constant-volume cylinder containing 7.44 g Hg is heated until the pressure reaches 3.80 atm. What is the final temperature in degrees Celsius?
Calculate the mole percent composition of the mixture. Assume that the response of the detector (area per mole) is the same for each component.
two identical positive charges exert a repulsive force of 6.4x 10^-9 when seperated 3.2x10^- 10 m. calculate the charge of each
suppose 2.3754g of copper(II) sulfate pentahydrate is heated to drive off the water of crystallization. Calculate what weight of anhydrous salt will remain?
estimate the mean ionic activity coefficient for NaCl in a solution that is 0.020 mol/kg NaCl(aq) and 0.035 mol/kg Ca(NO3)2 (aq)
If 125 cal of heat is applied to a 60.0 g piece of copper at 24C, what will the final temperature be? The specific heat of copper is 0.0920cal/(g x C).
The shielding of electrons gives rise to an effective nuclear charge,Zeff , which explains why boron is larger than oxygen. Estimate the approximate Zeff felt by a valence electron of boron and oxygen, respectively
A pound of coffee beans yields 48 cups of coffee. How many milliliters of coffee can be obtained from 1 g of coffee beans?
A 0.0355 g sample of an unknown molecular compound is dissolved in 1.000 g of liquid camphor at 200.0°C. Upon cooling, the camphor freezes at 157.7°C. Calculate the molar mass of the unknown compound.
at 84 degrees C the total vapor pressure of a solution contains 1.2 moles A and 2.3 moles B is 331 mmHg. Upon the addition of another mole of B to the solution, the vapor pressure increasing to 347mmHg.
how many grams of sulfur dioxide are produced when 90.0 g of thionyl chloride reacts with excess water according to the following equation? SOCl2+H2O --> 2HCl+SO2
a gas mixture with a total pressure of 770 mmHg contains each of the following gases at the indicated partial pressures: CO2, 122 mmHg; Ar, 209 mmHg; and O2, 191 mmHg. The mixture also contains helium gas. what is the partial pressure of the heliu..
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