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Given 25.00 mL of the unknown weak acid, 12 mL of NaOH solution was added to the unknown. Leave the unknown weak acid and NaOH concentrations as variables. The pH of the solution is 4.13. What is pKa for the acid?
the element lithium consists of two naturally occurring isotopes with relative abundances of 7.42 and 92.58. the atomic
You are given solutions of HCl and NaOH and must determine their concentrations. You use 26.6 mL of NaOH to titrate 100. mL of HCl and 21.4 mL of NaOH to titrate 50.0 mL of 0.0796 M H2SO4. Find the unknown concentrations. NaOH
Magnesium nitride (Mg3N2) is formed by the reaction of magnesium metal (Mg) with nitrogen gas (N2). No other products are produced. (A) How many grams of magnesium nitride can be made in the reaction of 35.00 g of magnesium and 15.00 g of nitrogen..
175g of water was heated from 15 degrees to 88 degress celsuis. how many kilocalories were absorbed by the water?
State whether the following reactions are spontaneous or non spontaneous at low temperature, high temperature or all temperatures
Calculate the equilibrium constant for the equation as written at 240 K (Dependence of temperature on enthalpy can be disregard). Express your answer to three significant figures. H2O(g) H2O(l)
A 496-mL sample of a gas at 263 oC is cooled at constant pressure until its volume becomes 241 mL. What is the new temperature in oC?
The weight of your 1285-kg car is supported equally by its four tires, each inflated to a gauge pressure of 36.0 lb/in2. What is the area of contact each tire makes with the road?
Estimate the average spacing between water molecules in liquid water by making use of 2 pieces of information: (a) liquid water has a density of 1 g/cm^3
A compound is known to contain 51.27% carbon and 27.30% oxygen by mass. Each molecule contains two atoms of oxygen. What is the molar mass of this substance
A block of zinc has a density of 7.133 g/cm^3 and atomic weight of 65.39 g. A) Calculate the atom density of the zinc. B) Find the macroscopic thermal neutron absorption cross section for zinc, assuming that microscopic cross section for absorptio..
If the methane contained in 5.00L of a saturated solution at 25 ^circ rm C was extracted and placed under STP conditions, what volume would it occupy.
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