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Half-life of the isotope potassium -40 is 1.26 * 10^9 year. Calculate time to disintegrate the sample from an initial activity of 8.5 * 10^4 dpm to 7.4 * 10^3 dpm. Here, dpm is disintegrations per minute.
What is the empirical formula of polyethylene? Please show step by step how you got this.
Briefly describe the process of recycling. Do you recycle? If yes, what types of items do you recycle? If not, why not?
The heat of vaporization (delta)Hvap of carbon tetrachloride (CCl4) at 25 degrees C, is 39.4 kj/mol. If 1 mol of liquid carbon tetrachloride at 25 degrees C has an entropy of 216 J/K, what is the entropy of 1 mol of vapor in equilibrium with the l..
There are two naturally occurring isotopes of bromine. 79Br has a mass of 78.9183 amu. 81Br has a mass of 80.9163 amu.
Draw the curve of pH vs mL titrant added for the titration of a weak acid with a strong base. Label the endpoint and explain why it does not occur at pH=7. Label the buffer region.
What is the nature of the substance(non polar, polar, ionic) and intermolecular force(ionic or van der waals if van der walls give type including h-bond)
What is the pH of a 1L buffer containing 1.5M Acetic Acid and 1.0M Sodium Acetate? What is the pH of the buffer when 0.5 moles of NaOH is added to solution? Assume no change in volume.
This procedure is potentially very lucrative because, after an initial extraction of energy from the groin, no fossil fuels would be required to keep the device running indefinitely. Would you invest in this idea? State your conclusion clearly and..
The pKa of acetic acid is 4.76. Next, compute the pH of the same solution to which 3.5 ml of 6.05 M HCL has as well been added. Ignore the volume of the added HCL in your computation since its quantity is trivial. Utilize the Henderson-Hasselbalch..
What volume will 500 mL of gas at 20°C and a pressure of 420 mm Hg occupy if the temperature is reduced to -80°C and the pressure is increased to 650 mm Hg?
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
The atmospheric oxidation of nitrogen monoxide, 2 NO(g) +O2(g) 2NO2(g), was studied at some temperature withinitial pressures of 1.000 atm of NO and 1.000 atm ofO2. A tequilibrium PO2=.506 atm calculate Kp 2NO(g)+O2(g) 2NO2(g)
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