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A sample of sodium has a relative abundance of 75% with a mass number of 23, a relative abundance of 20% with a mass number of 22 and a relative abundance of 5% with a mass number of 24. What is the average atomic mass?
A hydrocarbon is burned in an excess of oxygen to give 1.32g of carbon dioxide and 0.72g of water. What is the empirical formula of hydrocarbon
A 2.78 L sample of hydrogen chloride (HCl) gas at 2.61 atm and 28°C is completely dissolved in 651 mL of water to form hydrochloric acid solution. Calculate the molarity of the acid solution. Assume no change in volume.
If 4 g of CuSO4 is dissolved in 9.0x10^2 mL of 0.40 M aqueous NH3, what are the concentrations of Cu2+, Cu(NH34 2+, and NH3 at equilibrium? (Kf = 5x10^13)
Problem- Half of a mole (.5mol) of neon, an ideal gas, is isothermally and reversibly compressed at 305 K from an initial pressure and volume of 2.5 atm and 5.0 L to a final pressure and volume of 12.5 atm and 1.0 L. What are q and w for the compr..
How many grams of dipotassium phthalate (242.3 g/mol) must be added to 700 mL of 0.175 M potassium hydrogen phthalate to give a buffer of pH 6.00?
What is the first step in the reaction sequence of Aldol reactions under basic conditions? a. Removal of the aldehyde proton b. Removal of an alpha proton to form the enolate
An aqueous solution contains 12.5% NaCl by mass. What mass of water (in grams)is contained in 2.5L of the vapor above this solution at 55 celcius? the vaor pressure of pure water at 55 celcius is 118 torr.
The elemental mass percent composition of ascorbic acid (vitamin C) is 40.92% C, 4.58% H, and 15.51% O. Determine the empirical formula of ascorbic acid.
the boiling point of methanol ch3oh is 64.7 oc and delta h vap 71.8 kjmol. what is delta s for the vaporization of
Explain the acronyms mks, SI, and cgs. What are the metric prefixes for million and millionth? What are the four most common metric prefixes? Which is larger, a liter or a quart? What is the standard unit of volume in the SI?
morphine pkb 5.80 is the active ingredient in opium. it is used as an analgesic that directly acts on the central
Sometimes during a reaction contamination can be introduced into the sample. If this happens which of the following would be true about the mass of the sample if it were contaminated
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