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A mixture of ethanol and 1-propanol behaves ideally at 36C andis in equalibrium with its vapor. If the mole fraction of ethanolin the solution is 0.50, calcualte the mole fraction of the vaporphase
Which substance has the greater intermolecular forces? Explain. Which substance has the higher vapor pressure at 250 C?c. Which substance will have the higher boiling point?
Sucrose, the sugar extracted fromsugarcane and sugar beets, is an organic compound that contains 12carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms permolecule.
Explain why this atomic orbital arrangement cannot account for the observed bonding in NH3. Explain briefly the hybridization that must take place.
If the acyloin condensation were carried out with 4.60m Lbenzaldehyde (density = 1.04g/mL), 1.48 thiamine hydrochloride, and5.2mL 2.0M aqueous NaOH, what is the limiting reagent?
Iron crystallizes in a body-centered cubic structure. The volume ofone Fe atom is approximately 8.38x10-24cm3, and the density of Fe is 7.874 g/cm3.Calculate an approximate value for Avogadro's number
How many silver atoms are present in a vapor colume of 486 mL whenAg(l) and Ag (g) are in a equalibrium at 1360 degree celcies? (vapor pressure of silver at 1360 degree celcius==1.00mmHg.
A solution contaning 2.00g of an unknown substance in25.0g of naphthalene was found to freeze at 75.4 degrees celsious.what is the molar mass of the unknown substance?
How do you construct an electron dot expression for the change that occurs when an atom of zinc is converted to a Zn2+ ion?
In this experiment, 0.170g of caffeine is dissolved in 10.0 mLof water. the caffeine is extracted fromt he aqueous solution three times with 5.0 mL portions of methylene chloride.
The concentration of a chemical degrades in water ccording tofirst-order kinetics. The degredation constant is 0.2day-1. If the initial concentration is 100.0mg*L-1, how many days are required for the
How would the rate of disappearance of ethylbromide change if the solution were diluted by adding an equal volume if pure ethyl alcohol to the solution?
A certain liquid has astandard enthalpy of vaporization of 26.0 kJ/mol. Determine the energy exchanged with the surroundings as heat during the process of vaporizing 0.50 mol at 250 K and 750 Torr.
What structual feature is different in isotopes of aparticular element? What do all carbon atoms and ions have in common?
Oxygen gas generated by the decomposition of potassium chlorate iscollected over water. Assume the gas is saturated with water vaporat a partial pressure of 22.4mmHg. The volume of gas collected was
A sample of methane (CH4) gas contains a small amount of helium. Calculate the volume percentage of helium if the density of the sample is 0.70902 g/L at 0.0oC and 1.000 atm.
Consider the following reaction:FeSCN 2+ (aq) [red] in equilibrium with Fe 3+ (aq) [paleyellow] + SCN- (aq) [colorless] The solution was initially dark red in color.
One drop of water evaporates every hour. If there are 20 drops inone milliliter of water and the density of water is 1.00g/mL, how many water molecules evaporate per second.
Iodine solvent was added to a test tube. It is solid and nonpolar. When water was added, it turned from clear to ayellowish-brown. The mixture was immiscible.
A refrgerator cools by evaporating liquified CF2Cl2, dichlorodifluoromethane. how many kilograms of the liguid must be evapoarted to freeze a tray of 525 g water at 0 degrees C to ice at 0 degrees
A student pipets 10.0 0 mL of a 0.100 M solution of reagent Ainto a erlenmeyer flask. Reagent A is then titrated with atitrating solution containing reagent B.
A 8.68g sample containing solid potassium chlorate and other inert impurities was heated in test tube. the potassiumchlorate in the sample completely decomposed into potassiumchloride and oxygen gas
If the volume occupied by the carbon monoxide is 429.3 mLat a certain temperature and pressure. what volume of oxygen gas, at the same temprature and pressure, will be required to react with carbon
Is the reaction of magnesium metal and oxygen gas an oxidation-reduction reaction? If so, what is the change in oxidation number of each type of atom?
30 mg of calcium ( Ca2+ ) and 50 mg ofMagnesium ( Mg2+ ) are dissolved in 0.5 L of water.What is the total hardness of the solution expressed in mg/L asCaCO3?