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Air is approximately 80% nitrogen and 20% oxygen by volume, what is density of air at 273 K and 1 atmosphere? And at a altitude of 2550 ft would density of air be higher or lower, why?
Calculate the molar solubility of PbCl2 in a 0.20 M NaCl solution. The Ksp of PbCl2 = 1.7 x 10-5. Can any assumptions be made to simplify this calculation
Endorphins: What Are They and How Do They Work?, Describe in brief the chemistry and biology of the feel-good chemical, endorphins. Also explain why the name feel good
What is the pH of the solution during the titration when the following volumes of the NaOH have been added to 34.5-mL of the acid.
Given the following two half-reactions, write the overall balanced reaction in the direction in which it is spontaneous and calculate the standard cell potential.
Express the pressure values numerically in atmospheres, separated by commas. Enter the partial pressure of methane first, then ethane, then propane.
what is the pH of a buffered system made by dissolving 17.42 g of KH2PO4 and 20.41 g of K2HPO4 in water to give a volume of 200.0 mL?
What is methanol's vapor pressure It boils at 65.0 °C and has a heat of vaporization ΔHvap = 37.4 kJ/mol. at 22.0 °C?
Determine all concentrations after 15 minutes. What is the chlorine concentration. What is Q after 15 minutes?
Calculate the heat capacity of an aluminium block that must absorb 629J of heat from its surroundings in order for its temperature
What is the volume occupied by 25.6 g of argon gas at a pressure of 1.41 atm and a temperature of 411 K?
What is the pH at the isoionic point? What is the pH at the isoelectric point? Explain the difference between your answers in (a) and (b), including specifically why one result is larger than the other.
A 1.0 L buffer solution is 0.250 M LiC2H3O2 and 0.050 M HC2H3O2 . Which of the actions will destroy the buffer? (a)adding 0.050 moles of LiC2H3O2(b)adding 0.050 moles of HCl(c)adding 0.050 moles of HC2H3O2(d)adding 0.050 moles of NaOH.
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