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To find the % by mass of a compound in a given sample.
Dissolving 3.00 g of an impure sample of calcium carbonate in hydrochloric acid produced 0.656 L of carbon dioxide (measured at 20.0 degrees C and 792mm/Hg). Calculate the percent by mass of calcium carbonate in the sample. State any assumptions.
A tiny speck (8.3 x 10-7 mol) of americium-241 is used in smoke detectors, how many atoms of americium-241 are there in one of these smoke detectors?
A 774 mL gas sample at STP is compressed to a volume of 267 mL, and the temperature is increased to 32C. What is the new pressure of the gas in Pa? Answer in units of Pa.
List all the covalent and non-covalent interactions that exist between amino acid residues in a polypeptide (besides the peptide bonds).
Calculate the number of moles of sodium bicarbonate orginally present in the unknown mixture, knowing that 20.0ml of 0.100M HCL were used in the step 2 of titration, using methyl orange as an indicator.
An oligomeric protein has a molecular weight of 168000. A 420 mg sample was treated with an excess of 1-fluoro-2,4-dinitrobenzene (Sanger\'s reagent) until the reaction was complete
Describe the use of light absorbing reagents in amino acid chromatography. What are these reagents used for? Name two reagents that are commonly used and describe how they react with amino acids.
suppose the pressure inside a pressure cooker reaches 1.3 atm. By using the vapor-pressure table, estimate the temperature at which water will boil in this cooker
equilibrium constant Kc for the reaction: H2 (g) + CO2 (g) - H2O (g) + CO (g) a) in one experiment, a container is introduced in a mixture formed by the four shown in the reaction gases
What is the volume of an object that has a mass of 3.4 g and a density of 2.4 g/mL? choose one below: 1.4 mL 0.71 mL 1400 mL 710 L 14 mL
a balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He and 0.026mol H2 at 739 mmHg. what is the partial pressure of O2?
What is the pH when 100 mL of 0.1 M HCl is titrated with 50 mL of 0.2 M NaOH?
What is the euillibrium constant, Keq, for the reaction below if a vessel containing 0.45atm of SO2, 0.05 atm of SO3, and 0.25 of O2 has an equillibrium partial pressure for SO2 of 0.55 atm.
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