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What is the equilibrium constant Kc for the reaction below? Assume temperature is 25oC. (Hint, Represent the reaction below as a sum of reactions and then combine the corresponding K values to obtain Kc for the reaction below.) HF(aq) +NH3(aq) <----> NH4F(aq) What is Kc?
If energy obtained from burning 1.23 pounds of butane (feul value is 10.85 kcal/g) is used to heat 126.5 kg of water at an initial temperature of 20.7 degrees C, what is the final temperature
1. Using average bond enthalpies, predict which of the following reactions will be most exothermic:
The element lithium has two naturally occurring isotopes, 7Li (isotopic mass 7.0160 amu, abundance 92.5 %) and 6Li (isotopic mass 6.0151 amu, abundance 7.50 %). Calculate the atomic mass of lithium.
A piece of iodine is added to a dilute potassium hydroxide solution in a disproportination reaction. Write the unbalanced net ionic equation
If you have 375 molecules in a 10^-4 dilution, how many molecules were in the original solution
indicate whether each of the following statements indicates an acid or a base: a)makes a red ant sting burn. b)produces OH^- in water. c) has a soapy feel. d) turns litmus red.
Determine the activity of 50 mg of radium-226 (t1/2 =1600 years) in becquerels and in millicuries.
If 500 mL of air contains 2 x 1022 particles (atoms and molecules), how many particles do you inhale in one day if you breathe 15000 L of air?
Silver nitrate and sodium phosphate are reacted in equal amounts of 200. g each. How many grams of silver phosphate are produced?
Calculate the volume of 1.94×10-3-M H2SO4 solution needed to provide 4.83×10-3 g of H2SO4.
a large containerized planting that contains 79kg of soil. An analysis shows that you need to neutral 3.27 meq/100gof acidity. How much of finely ground pure CaCO3
what is the purpose of anhydrous cacl2? why it is important that none of the solid cacl2 be included in the final
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