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a sample of gas has a mass of 38.8 mg. it's volume is 224 mL at a temperature of 55 degrees C and a pressure of 886 torr. Find the molar mass of the gas.
if 77.0 mL of .150 M HCl (aq) is needed to neutralize all the NH3(g) from a 2.25 gram sample of organic material, calculate the mass percentage of nitroge in the sample.
the active ingredient in toothpaste is sodium fluoride, an anticavity agent. a 170 g tube of toothpaste lists the concentration of sodium fluoride a s0.24%. how many grams of sodium fluoride are in a toothpaste.
A Michalson interferometer had a mirror velocity of 2.75cm/s. What would be the frequency of the interferogram for (a) UV radiation of 350 nm. (b) visible radiation of 575nm, (c) infrared radiation of 5.5 um, and (d) infrared radiation of 25 um?
An air bubble was initially trapped in the buret but was dispensed during the back titration of the unreacted HCI. As a result of this technique error, will the reported amount of antacid in the sample be too high or too low? Explain
an experiment was performed to determine the amount of pyridoxine (B6) in a vitamin tablet. A tablet weighing 0.4006g was dissolved in 25mL of solution
How many grams of CO are needed to react with an excess of Fe2O3 to produce 558 g Fe? The equation for the reaction is: Fe2O3(s) + 2 CO(g) → 3 CO2(g) + 2 Fe(s)
Phosphorus-32 has a half-life of 14.0days . Starting with 4.00 g of 32p , how many grams will remain after 42.0 days?
Compute the mass of Au(gold) that occupies 5.0 X 10^-3 cm^3. If the density of gold (Au) is given=19.3 g/cm^3.
What is the Ag+ concentration when BaCrO4 just starts to precipitate? The Ksp for Ag2CrO4 and BaCrO4 are 1.1 x 10-12 and respectively.
In what direction do the functions point? What orbitals are"left" unused on the C atom?
Question about Half life problem, We are performing an experiment using half-life =4.5 x 10^3 days labeled phenylalanine in which the five atomic hydrogens are labeled.To perform the experiment
what is the maximum mass of maltitol (C12H24O11) you can add to 2.00 kg of pure water and still have the solution freeze? Assume that maltitol is a molecular solid and does not ionize when it dissolves in water.
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