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At 25 degrees C, the standard enthalpy of formation of KCl(s) is -435.87 kJ/mol. When one moles of KCl(s) is formed by reacting potassium vapor and chlorine gas at 25 degrees C, the standard enthalpy of reaction is -525.86 kJ/mol. Find delta H for the sublimation of potassium, K(s) --> K(g), at 25 degress C.
The specific heat of an unknown metal is found to be 0.233 J/K g. The Law of Dulong and Petit predicts a molar heat capacity of 26 J/K mol. Use this law to estimate the molar mass of the metal.
the rate of disappearance of HBr in the gas phase reaction 2HBr(g)-->H29(g)+Br2(g)is .301 at 150 degrees celsius. what is the rate of appearance of Br2?
How many grams of NaCl are contained in 350 ml of a 0.25 M solution of sodium chloride?
Calculate the temperature of the system once equilibrium has been reached. Assume that CP,m for Au(s) and H2O(l) is constant at their values for 298 K throughout the temperature range of interest.
Aluminum chlorhydrate is added to antiperspirants to stop people from sweating. If this compound contains neutral H2O molecules and Al3+, OH- and Cl- ions, and the formula of this compound is Alx(OH)5Cl 2H2O, what is the value of x in this formula
A portable CD player that draws 175 milliamperes of current is powered by Ni-Cd rechargable batteries. Compute the mass of NiO2 consumed when a disk is played for 115 minutes.
Use the Van Der Waals equation to calculate the pressures of the three real gases. Compare the plots and explain the origins of any differences you find.
containing granite basins tend to become acidified by acid rain more readily than lakes lying in calcium carbonate, CaCO3, limestone basins. Explain why?
The standard cell potential for the electrochemical reaction is 1.10V. Calculate the cell potential if the concentration of zinc ion and copper ion are 0.050M and 5.0M respectively at room temp.
450 mL of oxygen is bubbled through water at 10 degrees celsius and exerts 720.0 torr. What volume will the dry gas occupy at 730.0 torr and 10 degrees celcius?
What is the pH of a solution that contains 0.50 M H2CO3 and 0.50 M NaHCO3? (Ka1 = 4.3 X 10-7, Ka2= 5.6 X 10-11)
Calculate the heat energy released when 10.9 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.
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