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How many grams sodium chloride (NaCl) should be used in preparing 22 L of a solution containing 147 mEq/L? (atomic wt of sodium is 23, atomic wt of chloride is 35.5).
The diameter of Earth at the equator is 7926.381 mi. Round this number to three significant figures, and express it in standard exponential notation.
Check that in the collision of two structureless molecules the order of magnitude of the pre-exponential factor is of the same order as that predicted by collision theory. Go on to estimate the P factor for a reaction in which , and A and B are no..
Calculate the equilibrium constant Ksp for Mg(OH)2 (s) at 25 degrees celcius. Is the dissolution of Mg(OH)2 endothermic or exothermic
A sample of urea contains 1.009 g N, 0.145 g H, 0.432 g C, and 0.576 g O. What is the empirical formula of urea?
If 8.0 moles of the gas A is placed in a 60.0 L tank with 1.0 moles of B at 0 degrees celsius and 1 atm, they react according to the equation. 2A(g) + B(g) ---> 3C(g) + D(g) How many moles are present in the tank when the reaction is complete
a reaction has an activation energy of 123 kjmol and a rate constant of 0.200 s-1 at 311k. at what temperature will the
After doing some analysis, the probe determines that the gas pocket contains an element that has an ionization energy of I= 1350 Kj/mol
A flask contains 0.310 of liquid bromine, . Determine the number of bromine molecules present in the flask.
Calculate the amount (in mL) of a 1.520M NaOH that is required to add the following acetic acid solutions to prepare a buffer with the corresponding pH: pKa of acetic acid = 4.74
Equal numbers of moles of toluene and benzene are mixed and form an ideal solution. Compute the mole fraction of benzene in the vapor in equilibrium swith this solution.
Calculate the molar mass of the unknown gas. (Remember that the faster the rate of effusion, the shorter the time required for effusion of 1.0 L; that is, rate and time are inversely proportional.)
a gas mixture containing oxygen, nitrogen, and neon exerts a total pressure of 1.20 atm. If helium added to the mixture increases the pressure
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