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A standardized solution that is 0.0100 M in Na is essential for a flame photometric determination of the element. Explain how many grams of primary-standard-grade sodium carbonate are necessary to prepare 700.0mL of the solution?
an insecticide has the weight percents c55.6 h4.38 cl30.8 and o9.26. the approximate molar mass is 345 gmol. what is
A metal sample weighing 124.10 g and at a temperature of 99.3 C was placed in 42.87 g of water in a calorimeter at 23.9 C. At equilibrium the temperature of the water and metal was 41.6 C.
In normal breath, about 0.5 L of air at 1.0 atm and 293 K is inhaled. About 25% of the oxygen in air is absorbed by the lungs and passes into the bloodstream. for a respiration rate of 18 breaths per minute, how many moles of oxygen per minute are..
Cyclopropane has significantly less angle strain than cyclopropane, yet is only slightly lower in energy. How can this be true? How does this information relate to the fact that cyclobutane is not a planar molecule
A non-volatile solute depresses the freezing point of cyclohexane by 4C. If cyclohexane has the formula C6H12 calculate the mole fraction of solute and solvent present in the solution.
diethyl ether is a volatile organic compound. the vapor pressur of diethyl ether is 401 mmhg at 18 degrees c and th hat
Show that the proton condition for a NH4Cl solution is a linear combination of the mass balance equations and the charge balance equation.
A small piece of zinc reacts with dilute HCl to form H2, which is collected over water at 16°C into a large flask. The total pressure is adjusted to barometric pressure (752 torr), and the volume is 1544 mL.
Use acid-base concepts to comment on the fact that the only important ore of mercury. Is cinnabar, HgS, whereas zinc occurs in nature as sulfides, silicates, carbonates, and Oxides
A reverse osmosis unit is used to obtain drinkable water from a source that contains 0.570 g NaCl per liter. What is the minimum pressure (in torr) that must be applied across the semipermeable membrane to obtain water. Assume room temperature or ..
It was found that 19.31 mL of an HCl solution are needed to react completely with 322 mL of a LiOH solution that has a pH of 11.56. What is the molarity of the HCl solution?
An inexpensive hygrometer often used by cello players in Minnesota is based upon the color changes of cobalt(II)chloride as the relative humidity of the atmosphere changes.
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