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A coffee-cup calorimeter contains 150.0g of water at 25.1C. A 121g block of copper metal is heated to 100.4C by putting it in a beaker of boiling water. The specific heat of Cu(s) is 0.385 J/g*K. The Cu is added to the Calorimeter, and after a time the contents of the cup reach a constant temperature of 30.3C.
To determine the empirical formula of ester, 1.02g of the ester was burnt completely in excess oxygen. The only products formed were 2.20g of carbon dioxide and .90g water vapor. Calculate the mass of oxygen in 1.02g of the compound.
A 15.0 mg sample of a protein is dissolved in water to make 27.0 ml of solution. The osmotic pressure of the solution is 0.56 torr at 25 C. What is the molar mass of the protein?
Write the net ionic equation for the cell and identify which half cell will be cathode A cell constructed with a Ag/Ag+ half-cell and a Cu/Cu+ half cell.
what is the relationship between the dipole moment and the bond moment? how is it possible for a molecule to have bond
Carbon-14 has a half-life of 5730 years. A sample of carbon with a mass of 0.120 g has an activity of 40 decays/hr. The initial specific activity is assumed to have been 900 decays/hr/gram.
In a titration of HNO3, you add a few drops of phenolphthalein indicator to 50.00 mL of acid in a flask. You quickly add 23.75 mL of 0.0502 M NaOH but overshoot the end point
A toothpaste contains 0.24 % by mass sodium fluoride, NaF and 0.30 % by mass of triclosan, C12H7Cl3O2. The mass of one tube of toothpaste is 119 g.
If the acid dissociation constant, Ksuba, for an acid HA is 8 x 10^-4 at 25 degree C, what percent of the acid is dissociated in a 0.50 M solution of HA at 25 degree C?
Which of the intermolecular forces is the most important contributor to the high surface tension shown by water and What is the quantum of light called?
Determine the rate of heat transfer to the heat engine if both devices are reversible and all of the power output from the heat engine is used to supply the refrigerator
construct molecular models of threo- and erythro-2,3-dibromo-3-phenylpropanoic acid and show which diastereomer would be formed by anti addition of bromine to trans-cinnamic acid
Hardness in groundwater is due to the presence of metal ions, primarily Mg2 and Ca2 . Hardness is generally reported as ppm CaCO3 or mmol/L Ca2
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