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Two 10.0 mL samples of a Patient's Urine were taken. After adding a few drops of HNO3 and adding 5.0 mL ofAgNO3(excess silver) and filtering out the precipitateof AgCl. They obtained weights of 0
A student determined that the urine sample they were analyzing hada chloride concentration of 0.083 g/L (in a 10mL solution ofAgCl). What is the concentration in parts per million(PPM)?
The heat of combustion for the sample of coal is 23kj/g. What quantity of coal (in grams) must be burned to heat 500 grams of water from 20 degrees celsius to 95 degrees celsius to 95 degrees celsiu
How many grams of ethylene glycol, C2H4(OH)2, must be dissolved in 2000.0grams of water to lower the preezing point to -29.75 deg C? If the density of ethylene glycol is 1.12 g/mL, how many millilit
Coal reserves in the united states are estimated to contain 4.00 x 10^16 moles of carbon. if the efficiency is 40%, how much gross energy can this reserve produce through the traditional process of
The rate constants of some reactions double with every 10 degreerise in temperature. Assume that a reaction takes place at 291 Kand 301 K. What must the activation energy be for the rate constant to
Hydrides have been proposed as a means ofstoring hydrogen gas for fuel in solid form (the reactions thatform them are generally reversible). Take, for example magnesium hydride, MgH2.
The water at the beach on the lake front contains 9.6 parts per billion of E-coli. While swimming you swallow 1.0 L of this water. How many grams of this bacteria did you swaallow?
If 2.00 grams of aluminum nitrate is reacted with 3.50 grams of sodium carbonate, what is the theoretical yield in grams of aluminum carbonate?
A protein is known to contain 310 amino acid residues. How many grams does one molecule of this protein weigh? Hint: How do we estimate the molecular weight of a protein, when all we have are the nu
Hydrogen gas is generated by adding zinc metal to hydrochloricacid and collected over a liquid whoses vapor pressure is the sameas pure water at 20.0 degree C (18 torr).
Calculate the mass of nitrogen dissolved at room temperature in 80.0 L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.
Archeologists can determine the age of artifacts made of wood orbone by measuring the amount of the radioactive isotope14C present in the object.
When 2.365 g of an impure calcium oxide ore is reacted with excess sulfuric acid, 1.952 g of a white precipitate is obtained. Assuming that the reaction occurs with complete efficiency (100% yield),
Mass of a piece of metal is 172.105grams. It is placed into a graduated cylinder that contains 15.04mL of water. The volume of the metal and water in the cylinder is found to be 23.28mL.
The pK1 of threonine is 2.09. At pH 2.3, what percentage of threonine molecules would have their carboxyl group in the acidic (~COOH) form?
The approximation that chemists may sometimes casually use is that increasing the temperature of a system by 10 degrees Celsius may double the rate. Suppose you wanted to increase a reaction rate by
Calculate the mass of the precipitate formed when 2.27L of 0.0930 M Ba(OH)2 are mixed with 3.23 L of 0.0664 M Na2SO4.
An enzyme catalyzes the reaction so that the enzymatic reactionhas a ΔG‡ = 5 kcal/mol. By whatfactor will the reaction rate increase at 300K if we compare the catalyzed reaction to
Exactly 6.00 x 10-3 moles of zinc metal is dissolvedin dilute HCL (aq) in an ice calorimeter. The heat released meltsenough ice to produce a volume change of 0.254 mL in the ice-water mixture s
Explain the difference between a physical property and achemical property. What physical property will be used to separatethe components of the solid mixture?
What would be the order of release of labeled amino acids (first to last) when Edman degradation is run on the following hexapeptide: RDLQCA? (Enter your answer using the one-letter code.)
What is the difference between an element and a compound? Once separated, is each component of the solid mixture a pure element ora pure compond?