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Pure O2 diffuses through an aperture in 224 seconds whereas a mixture of O2 and another gas containing 80% O2(by wt) diffuses from the same in 234 seconds. Explain what is the molecular weight of the gas?
If the sun is a distance of 1.5 x 10^8 km from earth, how many minutes does it take sunlight to reach earth if light travels at 186,000 miles each second
Crystalline silicon has a cubic structure. The unit cell edge length is 543pm. The density of the solid is 2.33g/cm3. Calculate the number of Si atoms in one unit cell.
A sample contains Ba3(PO4)2, CdS, AgCl, NH4Cl, and ZnS. Identify the soluble ions after the addition of 6 M HCl; H2S and 0.2 M HCl; OH- to a pH of 8; and (NH4)2HPO4 with NH3. A) Ba3(PO4)2 B) NH4Cl C) CdS D) ZnS E) AgCl
What is the equilibrium constant for the reaction N2(g) + 3 H2(g) ?? 2 NH3(g) at this temperature?
Balance the following ionic Lewis structures by placing the appropriate coefficients. Leave a target blank to indicate the absence of a coefficient
When 0.100 mol of toluene(C7H8(l)) is burned in this calorimeter, the temperature is raised by 0.615C. The equation for the combustion reaction is
You diluted the 1:2 dilution 1:3 and finally got a reading that fit onto your standard curve. Your absorbance was 0.450. The best fit line equation : y=0.3413x. What is the actual concentration your unknown protein
Write the schematic shorthand notation chemists use to represent electrochemical cells for a cell where the anode consists of solid copper immersed in a 0.0100-M solution of copper (II) nitrate and cathode consists of solid silver immersed
While an additional mol of gas is added at constant temperature as well as volume to a flask containing 2.00 mol of gas at 25C and 1.00atm pressure, the pressure increases to 1.60 atm.
An ammonia/ammonium buffer solution contains 0.49 M NH3 and 0.62 M NH4+. The Kb value of ammonia is 1.8x10^5. Calculate the pH of this buffer.
A compound is found to contain 10.37 % phosphorus, 4.689 % nitrogen, and 84.95 % iodine by weight. What is the empirical formula for this compound
How much KOH (in grams) is required to neutralize a sample of 125mL of 0.5N HCl that has just been added to 875mL of distilled water
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