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Most community water supplies contain 0.5 ppm chlorine added for purification. What mass of chlorine must be added to 1500. L of water to reach this level. (Hint: the density of water is 1.00 g/mL).
Calculate the heat capacity per gram of metal. Assume no heat is lost to the calorimeter or the surroundings. The specific heat capacity for water is 4.184 J/g
the frequency factor a is 8.7x 10 12 s- and the activation energy is 63 kj/mol, What is the rate constant for the reaction at 75C
A piece of galena has a volume of 3.9 cm3. If the density of galena is 7.5 g/cm3, what is the mass (in kg) of that piece of galena?
Calculate the velocity (in units of m/s) of an electron having a mass of 9.09 x 10 -28 g and wavelength of 99.9 nm
The complex ion Co(H2O)6(2+)(aq) is pink when placed in solution. Addition of chlorine ions creates an equilibrium with CoCl6(4-) in the solution, which is blue in color.
Barium chlorate in solution mixed with Silver fluoride
Calculate the number of grams of sulfuric acid in 1 gallon of battery acid if the solution has a density of 1.33g/mL and is 38.9\% sulfuric acid by mass.
The vapor pressure of pure water at 25 degrees Celsius is 28.3 mmHg. Estimate the mass in grams of KCl needed per liter of pure water to reduce the vapor pressure of water at 25 degrees Celsius by 5%.
When a 0.369 g sample was studied by combustion analysis, 0.662 g of CO2 and 0.0897 g of H2O formed. How many moles of each of the following were in the original sample? C: ? H: ? Cl: ? What is the molecular formula?
when 1 mole of N2 is isothermally compressed from 1 atm to 1000 atm at 0C. Find the fugacity coefficient of N2 at 0C and 1000atm. HINT: Recall that for a pure material, the chemical potential is just the molar gibbs free energy.
What are the relative percentage of HCN and cyanide ion in a dilute aqueous solution at pH+9.2/ At pH=10.2
why is it best to cool the crucible and lid (and sample) in a desiccator rather than on the laboratory bench
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