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Calculate the total heat (in j) needed to convert 30.00 g of ice at -3.25 c to liquid water at 0.250 c: m.p. at 1 atm: 0.0 degrees c ^c liquid: 4.184 J/g x degrees c H fus: 6.02 kJ/mol c solid: 2.09
what is the Hvap of a liquid that has a vapor pressure of 616 torr at 84.1 c and a boiling point of 95.5 c at 1 atm. (answer in J/mol)
Normally supplied in metal containers under pressure, the fuel exists as a mixture of liquid and gas, so high temperatures may cause the container to explode. At 25.0°C, the vapor pressure of bu
Adenosine triphosphate (ATP) is used to generate chemical energy in plant and animal cells. The molecular formula for ATP is C10H16N5O13P3. Determine the mass percent composition of ATP
A 12.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter with a heat capacity of 5.65 kJ/°C. Using the information below, determine the final temperature of the calorimeter if the ini
Calculate the value of Kp for this dissociation reaction at 25 oC. b)If the volume of the cylinder is increased until the total pressure is 1.0 atm andthe temperature of the system remains constant,
Separate a mixture of alkanes. Which HPLC mode will you choose and why. Consider: Normal-phased, reverse-phased, ion-exchange, and size-exclusion).
Determine the boiling point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). Pure benzene has a boiling point of
a) Caboxylic acid and an ester b) bromobenzoic acid and benzoyl bromide c) succinic acid and napthoic acid d) maleic acid and malonic acid e) benzonitrile and benzamide f) acetic anhyride and butano
On one column two peaks have resolution 0.9 (not completely resolved). Calculate resolution for the same components on twice longer column.
Analyze run-off water for the presence of a.)heavy metals b.) Benzene-toluene-xylenes; and c.) polynuclear aromatic compounds. Which analytical method should be used in each case. Explain the choice
A solution transmittance is 35% at 260 nm. What will the solution absorbance be if you dilute 25.0 mL of the solution to 50.0 mL
Describe the determinants of the toxicity of a chemical. Describe the differences between synergism, antagonism, and potentiation.
Can the solubilities of lead formate Pb(CHO2)2(pKso=6.70, pKa=3.75) and copper iodate Cu(IO3)2(pKso=7.13, pKa=0.79) be made equal by adjusting pH?
What is the pH of a 10-5 M Co(ClO4)2 solution? Check your answer to be certain that Ca(OH)2(S) will not precipitate. (Assume no carbonate is present). The following are for the hydroxyl
Identify the first 36 elements in the periodic table and understand how their atomic structure affects their physical properties
A group of French scientists recently verified the difference between the two pouring methods by measuring the amount of bubbles in each glass of champagne poured two different ways and at three dif
A third sample, of mass 5.66 g was burned under different conditions to yield 2.49 g of HNO 3 as the only nitrogen containing product. Calculate the empirical formula of the compound.
Lead is found in Earth's crust as several different lead ores. Suppose a certain rock is composed of 38.0% PbS(galena), 25.0% PbCO 3 (cerussite), and 17.4% PbSO 4(anglesite).
Phosphorus is obtained primarily from ores containing calcium phosphate.If a particular ore contains 58.5% calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg
The chloride of an unknown metal is believed to have the formula MCl 3. A 1.891g g sample of the compound is found to contain 3.606×10^-2 mol. Find the atomic mass of M.
Given that the internal energy of water at 55 bar pressure is 1178 kJ kg-1. calculate the specific enthalpy of water at 55 bar pressure.
Sketch on a T - s diagram the following cycle for a gas turbine: Isentropic expansion through turbine 1 from pressure p1 down to intermediate pressure p3