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You have 279mL of a 1.25M potassium chloride solution, but you need to make .50M potassium chloride solution. How many milliliters of water must you add to the original 1.25M solution to make the .5
A 25-g sample of an alloy at 92 degrees celsius is placed in 50 grams of water at 20 degrees celsius. If the final temperature reached by the alloy sample and water is 27 degrees celsius, what is t
The vapor pressure of pure methyl alcohol at 19 degrees celcius is 90.0 torr and that of pure ethyl alcohol is 40.0 torr.
A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of 0.157g of the compound produced 0.218g of CO2 and 0.0310g of H2O. In another experiment, 0.103g of the compound produc
Which allows you to calculate the energy of the emitted light. What is the value of the constant needed to complete this equation?
A 300 mL stock solution contains 0.9 M Ca(CN)2. When 100 mL of the stock solution is diluted to 120 mL, how many moles of CN- ions will be contained in the dilute solution?
A 100 mL buffer solution initially has 1.00 M HClO (Ka = 3.0 × 10-8) and 0.75 M NaClO. What is the new pH when this 100 mL of 0.10 M NaOH is added to the initial buffer solution?
Given that the rate constant is 4.0×10-4 at 25.0 degrees C and that the rate constant is 2.6×10-3 at 42.4 degrees C, what is the activation energy in kilojoules per mole? Note that the v
Copper 64 used to study brain tumors. assume that the original mass of a sample of copper 64 is 26.000g. after 64 hours all that remains is 0.8125g of copper 64. what is the half life of this radioa
When 0.5000L of a 1.00M solution of Pb(NO3)2 is mixed with and excess of 1.00M solution of KI how many grams fo lead(II) iodide are formed.
A gas is compressed from an initial volume of 5.60 to a final volume of 1.23 by an external pressure of 1.00 . During the compression the gas releases 125 of heat. What is the change in internal en
Consider two hypothetical metals, X and Y, which can exist as metal ions X2+ and Y3+, respectively. For these two metals, the standard reduction potentials are.
How many milliliters of boiling water are required to dissolve 25g of phthalic acid? If the solution were cooled to 14oC, how many grams of phthalic acid would you recrystallize out?
If the freezing point of a .106 m CH3COOH solution is -.277 degrees Celsius, calculate the percent of the acid that has undergone ionization
Phosphorus, P, is combined with flourine F2, to give a gaseous compound with the formula PFx. If you start with 2.982 grams of P and isolate 12.129 grams of PFx, what is the value of x?
The solubility of Ba(NO3)2 is 130.5 grams per liter at zero degrees celcius. How many moles of dissolved salt are present in 4.0 liters of a saturated solution of Ba(No3)2 at zero degrees celsius?
Which order should you make the solutions from the stock solution in order to minimize error. Why? Assume rinsing is not thorough.
What type of transition causes this absorption? What is the reason for the multiple maxima?
What volume of pure O2(g), collected at 27°C and 746 torr, would be generated by decomposition of 128 g of a 50.0% by mass hydrogen peroxide solution?
How many molecules of acetylene (HCCH) react with 123 molecules of oxygen to produce carbon dioxide and water?
Assuming that the total pressure of the gases is 1.48 atm and that their mole ratio is 94 : 4.0 : 1.5 : 0.50, calculate the partial pressure (in atmospheres) of each gas.
volume of 20.0 mL of a 0.190 M HNO3 solution is titrated with 0.550 M KOH. Calculate the volume of KOH required to reach the equivalence point.
Cobalt-60 is commonly used as a source of B-particles. How long does it take for 87.5% of a sample of cobalt-60 to decay, given that the half-life is 5.36 years?
What is the concentration of Cu2+ in the sample? State any assumptions you might make and pay attention to significant figures.
If the minimum energy required to break the C-Cl bond in CF3Cl is 540 kJ/mol, what is the longest wavelength of radiation that will break this bond?