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Which of the following substances has a standard heat of formation of zero? A. pb @ 1000 degrees C B. C3H8 @ 25.0 C and 1 ATM pressure C. Solid glucose @ room temperature D.N2 @ 25.0 and 1 atm pressure
what pressure would it exert? (b) What pressure would it exert if it behaved as a van der Waals gas?
Compute the number of moles of sodium hydroxide ( NaOH ) in 23.75cm 3 of 0.150moldm -3
What is the volume of 135 mL of oxygen gas at 113°C and 870. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.
needed to titrate 45.25 mL of NaOH. Calculate the moles of NaOH needed for the reaction. Calculate the Molarity of the NaOH solution
The following osmotic pressures were observed for bovine serum albumin (BSA) in 0.15 M NaCl at 273 K. Calculate the molar mass of BSA.
If 67.0 mL of 0.119 mol/L NaOH(aq) and 35.0 mL of 0.193 mol/L HA(aq) are mixed, then what is [HA] at equilibrium? Assume that HA is a weak monoprotic acid with pKa=6.23 at 25oC
Molecular and ionic equations, What would be the proper balanced molecular and net ionic equations for each of these neutralization reactions?
3.00 g of NaOH are dissolved in 100.0 g of water in a coffee cup calorimeter. The temperature change is +7.50 degrees celcius. Calculate the enthalpy change involved in the process.
Calculate the surface tension from 0.028M soap solution at 293K. If the surface tension of 0.056M soap solution is 0.0433Joule per kelvin square. Surface tension of pure water is 0.0728 joule per meter square.
Both of the silicon-chlorine single bonds in are polar. In which direction should the polarity arrows point? away from central Si, towards Si, right or left
Transmittance, T, is defined as the intensity of light transmitted through a sample divided by the intensity of light incident on the sample. The absorbance, A, is defined as
An organic compound was prepared and purified by chromatography. A conductivity measurement showed the compound to be a nonelectrolyte
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