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At 25?C the heat of fusion of aluminum is 10.6kj/mol and the heat of sublimation is 326.4 kj/mol. What is the heat of vaporization of aluminum at 25?C?
An experiment shows that a 247 mL gas sample has a mass of 0.432 g at a pressure of 747 mmHg and a temperature of 28 degrees celcius.What is the molar mass of the gas?
a particular amino acid in an ion exchange chromatogra phy column. What is the peak width after the amino acid has migrated 100 cm?
C2H4 + 3O2 = 2CO2 + 2H2O if you start with 45 grams of ethylene (C2H4), how many grams of carbon dioxide will be produced.
PbO + NaCl + H2O ---> Pb(OH)Cl + NaOH How many grams of PbO and how many grams of NaCl would be required to produce 10.0g of Pb(OH)Cl? a) Mass of PbO required = ? b) Mass of NaCl required = ?
A 479-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 12.1 g CO2. What was the concentration of the HCl solution?
the mass of component A is 2.47 g, component B is 1.12 g, and component C is 0.654 g; what is the percent composition of component A?
What volume of hydrogen can be produced at 22.0C and 1.01atm pressure by the reaction of 25.0ml of 2M HCL with 0.3g Zn?
The freezing point depression constant, Kf, for water is 1.86?C/m. Suppose that 5.00 g of mercury(I) nitrate was dissolved in 100.0 g of water.
In a coffee-cup calorimeter, 1.50 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.65°C.
Determining the free ions of calcium on a similar sample of blood. recommend if the sample requires pretreatment or if it can be calculated directly In each case.
Half-life equation for first-order reactions: where is the half-life in seconds , and is the rate constant in inverse seconds . Part A What is the half-life of a first-order reaction with a rate constant
Determine how much heat is evolved or absorbed when 40.0 of lithium iodide completely dissolves in water.
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