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Dissolving calcium hydroxide in water is an exothermic process (delta H = -16.2kJ/mol). Calculate the mass of calcium hydroxide necessary to produce 23.6kJ of heat.
A Zeolite Softener was completely exhausted by passing 20,000 litres of water sample through it. If the Zeolite requires 150 litres of 5.5% NaCl solution for complete regeneration, calculate the hardness of the water sample.
If a 1.00g sample of a carbon-containing compound is burned in air, 0.75g of CO2(the only carbon-containing product) is produced. What is the mass% carbon in the compound
If the following reaction occurs, then what temperature will the water reach, assuming that the cup is a perfect insulator and that the cup absorbs only a negligible amount of heat
A 3.025 gram sample of this material is dissolved in 100mL water and titrated with .0875 M potassium hydroxide. It takes 23.78mL of KOH solution to reach the end point. Explain how many moles of KOH were used in the titration
A 1- flask is filled with 1.20 g of argon at 25 C. A sample of ethane vapor is added to the same flask until the total pressure is 1.25 atm.
Problem- For each compound draw an appropriate Lewis structure, determine the molecular geometry using VSEPR theory, determine whether the molecule is polar and identify the hybridization of all interior atoms: H3CSH
copper-64 is used to study brain tumors. assume that the original mass of a sample of copper-64 is 26.00g. After 64 hours, all that remains is 0.8125g of copper-64. What is the half-life of this radioactive isotope?
A reaction with a low enthalpy of reaction value is not spontaneous at low temperature but becomes spontaneous at high temperature.
Calculate the mass of nitrogen dissolved at room temperature in an 80.0 {rm L} home aquarium. Assume a total pressure of 1.0 {rm atm} and a mole fraction for nitrogen of 0.78.
Write a condensed structural formula for each of the following (e.g. CH4, C2H6, etc.)? Then please give me a brief description of how you do so?
1.2504 grams of X is dissolved in a 100mL of .05M sulfuric acid and diluted by a factor of a 100 with deionized water. What is the concentration of X
The equilibrium constant for this reaction at 55 °C is 6.68. A pharmaceutical chemist makes up 15.0 L of a solution that is initially 0.275 M in acetic acid and 3.85 M in ethanol. At equilibrium, how many grams of ethyl acetate are formed?
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