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In the manufacturing of computer chips, cylinders of silicon arecut into thin wafers that are 3.00 inches in diameter and have amass of 1.50g of silicon.
Vitamin D, responsible for strong bones, has a molar mass of 384and is known to be 84.4% carbon. How many carbon atoms are there in each molecule of Vitamin D?
When 5.56 mg of terephthalic acid are burned complete,y in excess oxygen, 11.78mg of carbon dioxide and 1.81 mg of water are produced. If the molar mass of terephtalic acid is experimently determine
When a nitrite containing sample with a mass of 3.000 g was analyzed, 16.65 mL of 0.1500 M Na2S2O3 solution was required to completely titrate the sample. What is the mass percent of NO2- ion in th
When a mixture of 13.5 grams of C2H2 and 13.5 grams of O2 isignited the combustion produces CO2 and H2O. Write a balanced chemical equation for this reaction and determine the limit ingreagent.
The molecular formula of acetylsalicylic acid (aspirin), one of the most common pain relievers, is HC9H7O4. How many molesof acetylsalicylic acid are in a 0.500gram tablet of aspirin? How many mole
Ascorbic acid (vitamin C, C6H8O6)is a water-soluble vitamin. A solution containing 81.0g of ascorbicacid dissolved in 230g of water has a density of 1.22g/mL at55oC. What is the mass percentage, th
At 20oC the vapor pressure of benzene(C6H6) is 75 torr, and that of toluene(C7H8) is 22 torr. Assume that benzene andtoluene form an ideal solution.
The heat of combustion of methane, a component of natural gas, is212 kcal/mol. That of propane, a component of LP gas, is530kcal/mol. On a gram-for-gram basis, which hydrocarbon is the better sourc
Acetylene has a pka of25. Calculate the Ka. The pka of phenol is 9.9. Which isthestronger acid: acetylene or phenol? Calculate the free energy ofionization of acetylene and phenol.
A gas has a volume of 450.0 mL. If the temperature is held constant, what volume would the gas occupy if the pressure were doubled? Reduced by one-fourth?
If your pipet was calibrated incorrectly so it transferred too muchsolution, the density you calculated for the liquid would tend tobe [larger,smaller] than the correct value. Why?
You and another student were each given an unknown compound. Both samples contained colorless material. You each used the same brand of commercially prepared TLC plate and developed the plates using
A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which the Rf value is .95, is observed. Does this indicate that the unknown material i
A 100.-L flask contains a mixture of methane, CH4, andargon at 25 degrees celcius. The mass of argon present is 228g and the mole fraction of methane in the mixture is 0.650. Calculate the total ki
A piece of metal weighing 5.10 grams at a temperature of48.6oC was placed in a calorimeter into 20.00 mL ofwater at 22.1oC, and the final equilibrium temperature was found to be 29.2oC. What is the
A solution contains 50.0g of heptane (C7H16)and 50.0g of octane (C8H18) at 25 degrees C.The vapor pressures of pure heptane and pure octane at 25 degrees Care 45.8 torr and 10.9 torr.
A Solution containing ethylene glycol and water has a vapor pressure of 7.88 torr at 10oC. Pure water has avapor pressure of 9.21 torr at 10oC. What is the mole fraction of ethylene glycol in the so
Calculate the final pressure of a sample of carbon dioxide (γ=1.40) that udergoes a reversible and adiabatic expansion from 57.4 kPa and 1.00L to the final volume of 2.00L.
If 77.0 mL of hydrogen gasis collected over water at 50 degree Celsius and 763 mm Hg, what isthe volume of dry gas at standard conditions (pressure is 1 atm andtemp is 0 degree Celsius)?
How much heat energy in kilojoules is required to convert77.0g of ice at -18 degrees celsius to water at 25 degreescelsius?
The vapor pressure of benzene is 100.0mmHg at 26.1 degrees celsius. Calculate the vapor pressure of a solution containing 24.6g of camphor dissolved in 98.5g of benzene.
Hydrogen peroxide solutions are purchased from chemical suppliers at a 3.0% by mass concentration. Calculate the molar concentration of a 3.0% H2O2 solution, assuming a density of 1.0 g/mL.
Suppose you have a box containing one mole of He atoms. If theenergy required to ionize a helium atom from its ground state toHe+ is 24.587 eV. Deterimine the ratio of the number of helium ions to
There are two compounds of titanium and chlorine. Onecompound contains 31.04% titanium by mass, and the second contains74.76% chlorine by mass.