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Find the distance to the star in the stellar luminosity thread if the apparent brightness of that star is 10^-3 W/m^2?
Phosphate can buffer in three pH ranges. Provide the chemical formulas of the buffer pairs as well as give the range in which each buffers. Begin with H3PO4/H2PO4-1.
What is the pH of a dilute solution of weak acid (pKa 5.6) with a concentration of 0.09M conjugate acid and 0.30 M conjugate base. What would the concentration of conjugate acid and conjugate base be if you added 0.10 moles of HCL to 1 liter of th..
A weak acid HA (pKa=5.00) was titrated with 1.00M KOH. The acid solution has a volume of 100.00mL and a molarity of 0.100M. Find the pH at the following volumes of base added and make a graph of the pH versus Vb:Vb= 0, 1, 5, 9, 9.9, 10, 10.1, and ..
What are the structures of the products that would be expected to be obtained on hydration of 1-octyne and 2-octyne?
Problem- Bromine has two isotopes of 78.918 u (50.69%) and 80.916 u (49.31%). What is the average atomic mass of Br
A student used a DCP solution (standardized to 9.94x10-4M) to analyze a sample of extract from 3.50g of solid food. The titration required 22.49mL of DCP. 91.75% of all the ascorbic acid in the food was collected in the extract. (MM Ascorbic Acid ..
Ionization energy is the energy required to remove an electron from an atom in the gas phase. The ionization energy of lead is 715.0 kJ/mol.
Which of the following molecules are polar? (There may be more than one; choose ALL the polar molecules for full credit)
question 1 octane is a compound that has less volatility than isobutane and n-butane. explain using structures of each
Determine the mL KOH needed at the equivalence point and the ph upon the addition of this volume of KOH.
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.
A 25.0 g sample of garden compost was analyzed for chloride content. The sample was dissolved in water and the chloride was precipitated as silver chloride. 1.58 g of dried precipitate was obtained. Calculate the percent chloride in the sample
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