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A 9.445g sample of a mixture of CuSO4 5H20 and BaCl2 2H20 is found to have excess SO4^2- ion upon mixing with water and 3.749g BaSO4 is isolated. What mass of BaCl2 H2O was used to make the BaSO4 isolated?
An iron bar of mass 885 g cools from 94°C to 5°C. Calculate the heat released (in kilojoules) by metal.
Write the chemical equation for the dissolution of NH4Cl in water. Write the chemical equation for the dissolution of NH4Cl in water, including heat
Compare the pH of a H2CO3 buffer that contains .10 M H2CO3 and .10 M NaHCO3 with another H2cO3 buffer that contains .15 M H2CO3 and .050 M NaHCO3.
A 141-mL sample of gas is collected over water at 22°C and 753 torr. What is the volume of the dry gas at STP?
You dissolve a compound with a molecular mass of 284.63 in a 10-mL volumetric flask. You remove a 1.00-mL aliquot, place it in a 25-mL volumetric flask and dilute it to the mark. The absorbance of this diluted solution at 345 nm was 0.451 in a 1.0..
which is connected to 2 oxygen atoms, one with is sp^3 and one sp^2 hybridized and so both oxygens have 2 lone pairs of electrons. All other single bonds consist of hydrogen.
Calculate the standard enthalpy of formation of liquid water (H2O) using the following thermochemical information
At 63.5C the vapor pressure ofH2O is 175 torr, and that of ethanol,C2H5OH, is 400 torr. A solution is madeby mixing equal masses of H2O andC2H5OH. What is the molality of ethanol in the solution
the molar heat capacity of carbon dioxide at constant pressure isnbsp 29.14 j mol 1 knbsp . what is the heat capacity
How can you decide whether an observed property of matter is a physical or chemical property
Explain how the carbonate system in natural waters provides buffering capacity
Consider the unbalanced equation above. A sample of impure mercury(II) oxide is heated and the HgO decomposed completely. If 580. mL of O2 is collected by displacement of water at a barometric pressure of 790.0 mm Hg and 25.0°C,
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