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Calculate the molecular weight of an unknown substance if 0.2064 g of solid was added to 25.00 ml of cyclohexane and the resultant solution exhibited a freezing point depression of 2.1 degrees celc
Calculate the pH after 0.020 mol HCl is added to 1.00 L of each of the four solutions. A mixture containing 0.100 M HONH2 and 0.100 M HONH3Cl
Molecular Mass by Freezing point Depression (Preliminary Lab) The following errors occurred when the above experiment was carried out. How would each affect the calculated molecular mass of the solu
A volume of 95.0ml of h2o is initially at room temperature 22.0 C. A chilled steel rod at 2.00 *C.is placed in the water. If the final temperature of the system is 21.2 *C. What is the mass of the
Hydrogen and oxygen gas combine explosively to produce water. Write a balanced chemical equation for this process. If 10 mol of hydrogen reacted with oxygen, what volume of liquid water could be produ
What is the molarity of Cl^- ions in a solution formed by dissolving 7.20 g of the mixture in enough water to form 500.0 mL of solution?
How many mL of a 0.136 M aqueous solution of aluminum bromide, AlBr3, must be taken to obtain 17.3 grams of the salt?
The density of benzene at 15 degrees C is 0.8787 g/mL. Calculate the mass of 0.1500 L of benzene at this temperature.
Find the gram formula mass of each compound.
How long would it take for 1.50mol of water at 100.0 degrees to be converted completely into steam if heat were added at a constant rate of 16.0J/s ? the constants are: Specific heat of ice: 2.09J(g
An unknown compound has the formula CxHyOz. You burn 0.220 g of the compound and isolate 0.312 g of CO2 and 0.191 g of H2O. What is the empirical formula of the compound? If the molar mass is 62.01
Acetylene gas is produced by adding water to calcium carbide. How many moles of cac2 can be formed from 98g of h20? How many grams of acetylene are produced by adding water to 5g of CaC2?
Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution.
Dry ice (solid CO2) has a vapor pressure of 1 atm at -77.2 deg celsius and 2 atm at -69.1 deg celsius. Calculate molar enthalpy of sublimation for dry ice.
Draw the structure of the major organic product in the following hydroboration-oxidation reaction. (Sia = siamyl = sec-isoamyl = 1,2-dimethylpropyl.)
Calculate the de Broglie wavelength of an electron in the ground state of the H atom. Show that this wavelength is equal to the circumference of the "orbit"
The heat evolved when a mole of octane undergoes complete combustion is 1303 kcal. This is called the heat of combustion. How many kcal of heat wil be generated when 148 grams of octane react with 952
Calculate the mass of silver chloride required to plate 215 mg of pure silver if silver chloride contains 75.27% Ag.
How efficient is the extraction of the tea leaves containing 1.0 g of caffeine with the two 3 mL portions of chloroform over that of a single-step reaction?
Calculate the value of deta S when 1.20 mol CH3OH (l) of is vaporized at 64.7 C. The normal boiling point of methanol is 64.7 C, and its molar enthalpy of vaporization is delta H = 71.8 KJ/mol.
By how much would the pH change, and in which direction, if we added to this solution enough base to neutralize 10% of the total acid?
A tank with a total pressure of 4.7 atm has a mixture of gases that is 72% nitrogen, and the rest is oxygen. What is the partial pressure of the nitrogen? The oxygen?
Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m. Assume the van't Hoff
Suppose you have 10 ml of 0.10m sucrose solution. you add 90 ml of water to the solution. Do the number of sucrose change? Does the molarity change?