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A patient needs to take 875 mg of ibuprofen twice daily. The pills in the bottle are each 250. rm mg. How many pills does the patient need to take each time she wants the 875 mg dosage? Assume that these pills are scored and can be cut in half if necessary.
A 0.170 mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2+ ions at equilibrium. Assume the formation constant of Ni(NH3)6 is 5.5 x 10^8
The temperature dependence of the reaction rate constant is given by the equation: ... ln k = ln A - Ea/RT ... ... Where: k = rate constant T = temperature A
what mass of solid sodium formate of mw 68.01 must be added to 140 ml of 0.57 moll formic acid hcooh to make a buffer
How many moles of Fe(NO3)3 are required to prepare a 354.6 mL solution that is 9.737 moles/liter of NO3-?
Order of reactivity, Suggest an explanation for the fact that the order of reactivity of the halides toward n-butylbrosylate in acetone
Why is the same volume of thiosulfate used in each reaction? What is the purpose of the thiosulfate? [You must explain the technical reasons for including the thiosulfate
A solid hydrate weighing 2.691g was heated to drive off the water. A solid anhydrous residue remained, which weighed 2.259g. If the anhydrous residue has a formula weight of 282, How much moles of water are present in one mole of anhydrous salts
What volume and mass of steam at 100.°C and 1.00 atm would, during condensation, release the same amount of heat as 100. cm3 of liquid water during freezing.
To a .015 M solution of Oxalic acid is added a strong acid until pH is .5. Calculate concentration of oxalate ion in resulting solution no volume change Ka oxalic acid is 3.78 x 10-6
Which of the following statements for E2 reaction is/are correct? a) no rearrangement occurs b) the rate determining step is bimolecular c) the reaction is stepwise d) protic solvents are generally favored
Calculate the concentrations of all species in a 0.310-M solution of H2X if K1 = 1.00E-04 and K2 = 1.17E-07
An ideal gas mixture of 1.00g N2 and 3.0g He is placed in a 1.00L container at 30 °C. What is the partial pressure of He
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