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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 involved
COMPOUND BOILING POINT
NH3 -33.4
PH3 -87.5
AsH3 -62.4
SbH3 -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.
14.0 moles of gas are in a 6.00 tank at 22.6. calculate the difference in pressure between methane and an ideal gas
Determine the theoretical yield of H2S (in moles) if 4.0 mol Al2S3 and 4.0 mol H2O are reacted according to the following balanced reaction. A possibly useful molar mass is Al2S3 = 150.17 g/mol. Al2S3(s) + 6 H2O(l) ? 2 Al(OH)3(s) + 3 H2S(g) 18 mol..
For each of the following, calculate the concentration of Tris, Tris-H+ and the pH of the solution in each of the following solutions.
flask apparatus, which now contains 2.00 L H2 at a pressure of 360 torr and 1.00 L N2 at an unknown pressure. if the total pressure in the flasks is 320 torr after the stopcock is opened, determine the initial pressure of N2 in the 1.00-L flask.
Number of exhaled molecules, Total mass of the atmosphere is equivalent to that in a layer 7 kilometer deep with density equal to the density at the surface
A United Nations toxicologist studying the properties of mustard gas, S(CH2CH2Cl)2, a blistering agent used in warfare, prepares a mixture
if you added 75.0 ml of a 0.555 M solution of NaCl to enough water to produce 950.0 ml of solution, what would be the resulting molarity?
In the bromination of ethane (C2H6) reaction, one wants to produce 10.0 g of C2H5Br product. How many grams of C2H6 would be needed to react with excess Br2.
if .740 mol of a novolatile nonelectrolyte are dissolved in 3.80mol of water what is the vapor pressure ph20 of the
According to molecular orbital theory, how many unpaired electrons are there for the molecules/ions given below in their ground states?
Derive an equation for emission rate as well as concentration rate of carbon monoxide as a function of time? Considering a room with candle emitting CO.
If 0.1800 g of impure soda ash (Na2CO3) is titrated with 15.66 mL of 0.1082 M HCl, what is the percent purity of the soda ash. Na2CO3(aq) + 2 HCl(aq) ? 2 NaCl(aq) + H2O(mc048-1.jpg) + CO2(g)
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