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Calculate the standard reaction enthalpy for the formation of boron trifluoride, which is widely used in the chemical industry:B2O3(s) + 3CaF2(s) > 2BF3(g) + 3CaO(s).The standard enthalpy of form
The enthalpy of fusion of methanol (CH3OH) is 3.16 kJ/mol. How much heat would be absorbed or released upon freezing 25.6 grams of methanol?
How many molecules of ethanol CH2H5OH (the alcohol in alcoholic beverages) are present in 145mL of ethanol? The density of ethanol is 0.789g/cm3
The volume of CO2 formed is 141 mL at 27°C and 742 mmHg. What is the molarity of the HCl solution?
How many liters of NO(g) are produced when 0.85L of 2.00M HNO3 solution is added to 216 of Ag according to the equation. Which reactant is the limiting reactant?
Acetylene (C2H2) will burn in the presence of oxygen. How many grams of water can be produced by the reaction of 2.40 mol C2H2 with 7.4 mol O2?
What is the mass percent composition of aluminum in aluminum oxide?
a cylinder measuring 5.7 cm wide and 6.8 cm high is filled with gas. The piston is pushed down with a steady force measured to be 11 N. Calculate the pressure of the gas inside the cylinder.
What is the total ionic equation for a reaction between a solution of sodium hydroxide (NaOH) and a solution of perchloric acid (HClO4)?
A chemistry student needs of 40 ml chloroform for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of chloroform is 1.48g x cm^-3 . Calc
When 1 mole of H2 gas reacts with 1 mole of F2 gas, 2 moles of HF gas are produced and 536 kJ of energy is released. Is this an endo or exothermic reaction? Write a thermochemical equation for this
A rigid flask is initially filled with 4.00 atm of NO2(g) and no N2O4(g) at 100 C. After equilibrium is achieved, the pressure of NO2 is 1.56 atm. Assuming constant total volume (not constant pressu
A student placed 16.5 g of glucose (rm C_6H_{12}O_6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-rm mL mark on
If you dilute 750.00 mL of a 4.117 × 10-4 M solution into a 2.00 L volumetric flask and fill to the line with water, what would be the final concentration of the solution?
The gases leave the reactor flowing at a rate of 10m^3/min @ 380 degrees C and 205kPa absolute. assuming ideal gas behavior, determine the feed rate of air in kmol/min.
Since water does absorb CO2 from the atmosphere and since CO2 dissolved in water causes it to be slightly acidic, will the use of deionized water that has not been boiled cause the mass of acetic ac
If 30.0mL of .150M calcium chloride is added to 15.0 mL of .100 M silver nitrate what will be the final concentration of all ions tha remain in the solution?
A 29.0-g sample of water at 270. K is mixed with 48.0 g water at 340. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
An aerosol spray can with a volume of 270 ml contains 3.0 g of propane gas as propellant. What is the pressure in atms if the can is 20 degrees celsius?
The heat of vaporization of the compound is 27.49 kj/mole. The heat required to convert 50.0g of the compound from the liquid at 5.0 celsius to the gas at 80.0 celsius is?
How many moles of ammonium sulfate can be made from the reaction of 30.0 mol of NH3 with H2SO4 according to the following equation? 2NH + H2SO4 > (NH4)2 SO4
How much heat is required to convert 27.0 grams of ethanol at 28 degrees celcius to the vapor phase at 78 degrees celcius?
In the titration of 50.0 mL of 1.0 M methylamine, CH3NH2 (Kb = 4.4 10-4), with 0.50 M HCl, calculate the pH under the following conditions.at the stoichiometric point
Molar CuSO4(aq) and Pb(NO3)2(aq) solutions are in separate compartments of a voltaic cell. If sulfuric acid is then added to the Pb(NO3)2 solution, thereby forming a precipitate of PbSO4, what will
A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.185 g of this subunit was dissolved in enough water to produce 2.00 rm mL of solution. At 28