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1. Adter exercising on a hot summer day and working up a sweat, you often become cool when you stop. What is the molecular-level explanation of this phenomenon?
2. The chlorofluorocarbon CCl3F has an enthalpy of vaporization of 24.8 kJ/mol. To vaporize 1.00 kg of the compound, how much thermal energy transfer is required?
3. The molar enthalphy of vaporization of methanol is 38.0 kJ/mol at 25Celcius. How much thermal energy transfer is required to convert 250. ml of alcohol from liquid to vapor? The density of CH3OH is 0.787 g/mL at 25Celcius.
4. Briefly explain the variations in the boiling point below. In ur discussion be sure to mention the types of intermolecular forces involvedCOMPOUND BOILING POINT
NH3 -33.4PH3 -87.5AsH3 -62.4SbH3 -18.4
5. Methanol, CH3OH, has a normal boiling point of 64.7 C and a vapor pressure of 100 mm Hg at 21.2 C. Formaldehyde, H2C=O, has a normal boiling point of -19.5 C and a vapor pressure of 100 mm Hg at -57.3 C. Explain why these two compounds have different boiling points and require different temperatures to achieve the same vapor pressure.
the hope diamond weighs 44.0 carats. determine the volume occupied by the diamond given that its density is 3.5 gcm3 at
During an experiment 4 different solutions are dropped onto a surface to measure their drop diameter in mm.
the edge of a body-centered-cubic unit cell of an element y was found to be 3.16 x 10-8 cm. the density of the metal is
Draw the skeletal structure of the organic product obtained when benzyl bromide reacts with solid Mg in diethyl ether. Draw the skeletal structure of organic product obtained when the product from (a) above reacts with ethylene oxide followed by aci..
Calculate the heat required to raise the temperature of 125 g of water are heated from 20.0oC to 100oC based on a specific heat of water of 4.184 J/g oC.
A buffer solution is.290M in a weak base through kB of 2.8*10-5 and .490M in the conjugate acid, what is the pH
If the temperature and pressure remained constant, what is true about the volume of the gas in the balloon?
Calculate delta E for the combustion of a gas that releases 195.0 kJ of energy to its surroundings and does 54.5 kJ of work on its surroundings.
The mixture was analyzed spectrophotometrically and found to be 1.84*10^-3 M in I3-. Calculate the molarity of I3- in the original sample
Aluminum is refined from the mineral bauxite, which is mostly aluminum hydroxide (Al(OH)3). Presuming that an ore sample is approximately
The molar energy of vacancy formation for silver (Ag), ?Hv, is 84 kJ/mol. Given this information, determine for Ag the vacancy density (number of vacancies/cm3) at 1103 K. Assume the pre-exponential factor is one.
Provide answers for (a)-(d) based the following unbalanced chemical equation. Al + Cl2-> AlCl3 (a) Balance the equation.
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