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Hydrazine, N2H4, is used as a rocket fuel. It reacts with oxygen to to form nitrogen and water. How many grams of hydrazine would be needed to react with 100 grams of oxygen?
If the aluminum block is initially at 25^circ C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization of the alcohol co
A solution is prepared by dissolving 2.33g of C60 in 100.0g of toluene. Given that the vapor pressure of pure toluene is 5.00kPa at 30C what is the vapor pressure of toluene in the solution?
How many grams of sodium lactate (NaC3H5O3) should be added to 1.00 L of 0.260 M lactic acid (HC3H5O3) to form a buffer solution with pH 2.90? Assume that no volume change occurs when the NaC3H5O3 i
How efficient is the extraction of tea leaves containing tra1.0g of caffeine with two 30-mL portions of chloroform over that of of a single-step extraction(KD = 8.36 at 25 degrees C)
pka2=6.88, pka3=7.90,pka4=12.10) assume you begin with 10.0mL of a .10M solution. Calculate the pH of the solution and the equilibrium concentrations of all species present.
A student had 1.00 L of a 1.00 M acid solution. Much to the surprise of the student, it took 2.00 L of 1.00 M NaOH solution to react completely with the acid. Explain why it took twice as much NaOH
Calculate the enthalpy change, Delta H, for this reaction per mole of rm X.
Aluminum oxide (Al2O3) is a widely used industrial abrasive (corundum, emery). How is the hardness of an ionic material related to its lattice energy?
How many moles of Na3C6H5O7 can be produced if one tablet containing 0.0119 mol of NaHCO3 is dissolved?
Find the mass of sodium required to profuce 5.68 L of hydrogen gas at STP from the reaction described bu the following equation: 2Na + 2H2O → 2NaOH + H2.
Calculate the pH of a solution made by adding 18 g of sodium acetate, NaCH3COO, to 20. g of acetic acid, CH3COOH, and dissolving in water to make 100. mL of solution.
At a particular temperature and [A]0 = 2.00 x 10-2 concentration versus time data were collected for this reaction. Calculate the half-life for this reaction.
Explain the main concept behind the VSEPR theory of molecular shape. How do both number and type of electron pairs influence the shape of a molecule?
how much fuel should he carry? (For the sake of simplicity, assume that the transfer of heat is 100% efficient.)
How many grams of water can be cooled from 34°C to 26°C by the evaporation of 81 g of water? (The heat of vaporization of water in this temperature range is 2.4 kJ/g. The specific heat of wa
The mass of water is 92.6 grams, the initial temperature of the water is 58.9 degrees celsius, the mass of teh liquid nitrogen added to the water is 57.1 grams, and the final temperature after the
Propane is often used for gas grills and is typically purchased by filling a propane tank with 20 pounds of propane. What is the enthalpy change when 18 pound of propane is burned? Use the conversi
The decomposition reaction is at equilibrium, how would the following changes affect the total quantity of ammonia in the flask once equilibrium is re-established?
a 12.6 g sample of NH4NO3 is dropped into a constant-pressure calorimeter containing 175 g of water at 23.5 C. What temperature will the water reach, assuming that the calorimeter container does not
For the equation 3Fe+4H2O=4H2+Fe3O4 If 625 g of Fe3O4 is produced in the reaction, how many moles of hydrogen are produced at the same time?
Given the following equation, what volume of hydrogen gas, H2, is released at STP conditions by the action of 8.18 g of Zinc;
Diethyl ether is a volatile organic compound. the vapor pressur of diethyl ether is 401 mmhg at 18 degrees C and th hat of vaporization = 26.o kJ/mol. calcuate the vapor pressure of diethyl ether at
A mixture of CO, CO2 and O2 is contained within a 275 mL flask at 0C. If the total pressure is 780 torr, the CO has a partial pressure of 330 torr and the CO2 has a partial pressure of 330 torr, wh
Write a chemical equation for this process, which occurs in an acidic environment. (b) Estimate the values of E⊕, ΔrG⊕, and K for the reaction at 25°C.