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calculate the energy involved in the conversion of 272 g of steam at 373 K to ice at 243 K. Be sure to use the correct sign.
what will be the final temperature. The specific heats of ice and water are 2.09 and 4.184 J/g.°C, respectively. The heat of fusion for water is 334 J/g.
Given that the specific heat capacities of Fe(S) and water are 0.450 J/g? and 4.184 J/g?, respectively, what is the final temperature of the system
A flask contains a small amount of liquid at 25oC. The vapor pressure of the liquid in the flask is 109 torr. If the volume of the flask were to double
Suppose we want a soln containing 150 micrograms of the protein at a concentration of .5 mg/ml. To do this we will first evaporate the liquid from enough of the protein soln to get 150 micrograms. H
Determine the concentrations (in M) of acetic acid and sodium acetate in 0.2 M 'acetate' buffer, pH 6.0. The pKa for acetic acid is 4.76.
Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium concentration of NO2(g).
Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [N2]eq = 3.6 M, [O2]eq = 4.1 M, [N2O]eq = 3.3 × 10-18 M.
A sodium chloride solution is made at 68 deg F that contains 16.28 g of NaCl in 100 cc of fresh water. The fresh water density is 0.9982 g/cc. What is the density of the solution in g/cc and Lbm/gal
100 ml of 1 M acetic acid (pKa 4.76) are placed in a flask. The following volumes of 1 M KOH are added, and the total volume is adjusted to one liter with water.
Water soluble proteins do not contain amino acids with hydrocarbon R-groups. The hydrocarbon chains on these amino acid R-groups aren't long enough to make them not soluble in water.
Draw a Lewis structure for ammonia NH3-.Show all unshared pairs and formal charges, if any. Assume that bonding follows the octet rule.
if the observed rate constant for the oxidation reaction at 35 C is 6.75*10^-2 min^-1, and at 25 C is 3.25*10^-2 min ^-1. what is the activation energy for the reaction
A certain technique is known to have a mean of 0.500 and standard deviation of 1.84*10^-3. itis also known that Gaussian statistics apply. How many replicate determinations are necessary if the stan
The tire is filled with dry air at sea level and a temperature of 60F to 32lb/in^2. Standard sea level pressure is 101325 Pa at 0 degree C (STP). How many moles of air are contained in the tire. How
Consider the fundamental units of each term in the equation. What physical quantity is represented on each side of the equation
The antibacterial agent sulfamethoxazole is an unionized acid with a pKa of 5.0. What is the ratio of this drug in buffered gastric fluid of pH 3.0. What is the percent ionized to unionized
Calculate the ratio of ionized to unionized drug forms that would exist in the plasma at physiological pH (7.4). What is the percent ionized to unionized
What is the ratio of ionized to unionized molecules at pH 8.5. What percentage of the molecule is ionized at pH of 8.5
Draw the acid/base balanced reaction when 4-methylphenol is reacted with 50% potassium hydroxide solution
500.0 mL of 0.160M solution of H3PO4 is combined with a 300.0 mL of a 0.245M solution of Ba(OH)2. What is the maximum mass of solid Ba3(PO4)2 that can be collected
Which is the electrophilic site in the following compounds. A. CH3Cl B.H3C-O-CH3 with two lone pairs around O C. BH3. What is the nucleophilic site in each of the following molecules.
A solution 14.3 % (by mass) HCl. The density of the solution is 1.08 g/mL. What is the molarity of the solution
Find the absolute and percent relative uncertainty and express each answer with a reasonable amount of significant figures. 5.1(+-0.3) - 3.7(+-0.2) Need Numeric Result, Absolute Error, and Relative