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The nuclide 198 au 79 has a half life of 64.8 hours. what is the rate constant for the decay of 198 au 79. how much of a 0.0100g sample of 198 au 79 remians after 1 day.
A gaseous mixture of O2 and Kr has a density of 1.184 g/L at 385 torr and 300. K. What is the mole percent O2 in the mixture?
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 -> NH4+(aq) + NO3(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal places. Enter scientific notation as 1.23E4. (a) When ..
a gaseous sample of a compound has a gas density of 0.977 gl at 710.0 torr and 100.0 c. what is the molar mass the
a gas mixture contains 4.6 g ofN2, 8.8g of H2 and 16.6g of CH4. What is the mole fraction of H2 in the mixture
If the initial surface coverage is 8.9*10^16 molecules/cm^2, how long will it take for one-half of the film to evaporate? b. What fraction of the film is left after 10 s? Assume the same initial coverage as in part a.
what is the enthalpy of vaporization of acetone ch3coch3 at its normal boiling point of 56.2?c? the entropy of
A 35.00 mL solution of 0.2500 M HF is titrated with a standardized 0.1978 M solution of NaOH at 25 C. What is the pH of the HF solution before titrant is added
The molar heat cacpacity of silver is 25.35 J/ mol C. How much energy would it take to raise the temperature of 11.1g of silver by 14.2 C? B) Find the specific heat of silver?
Consider the exothermic reaction A(g) + B(g) C(g) + D(g). Would you expect the addition of heat to lead to the formation or consumption of A(g)? Why?
The memory metal, nitinol, is a alloy of nickel and titanium. It is called a memory metal because after being deformed, a piece of nitinol wire will return to its original shape
Which of the following statements is/are correct. a) Water is an example of non-polar solvent. b) Any solution always conatins an electrolyte c) NONE d) A solute is always molecules dissolved in water and cannot be ions.
Calculate the moles of silver nitrate and sodium chloride. (c) Which reactant is the limiting reagent? (d) Determine the theoretical yield in grams of silver chloride formed.
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