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What information is obtained from analyzing the blank? Is this sample 100% elution solvent? Wht is it is not?
A cook wants to heat 1.75 of water from 26.0 to 100.0 If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produces 49.3 of heat per gram.
A 60.0 g sample of an alloy was heated to 96.0 °C and then dropped into a beaker containing 87.0 g of water at 24.1 °C. The temperature of the water rose to a final 27.63 °C.
What is the minimum potential (V) required to produce both the oxidation and reduction products written above?
Determine the ionization energy (in kilojoules per mole) of a metallic element if light of wavelength 67.2 nm ejects electrons with a speed of 2165 km/sec.
Battery acid is 35% sulfuric acid in water and has a density of 1.29g/ml. What is the mass of sulfuric acid in 1.00L of battery acid?
When heated, KClO3 reacts to produce KCl and O2. How many grams of KClO3 are needed to produce 791 ml of O2 at STP conditions?
In a typical experiment, you drop a gelatin capsule containing 0.1458 g of an Al-Zn alloy sample into an HCl solution. a) Write the equations that represent the chemical reactions that take place after the capsule has dissolved in HCl?
The vapor pressure of pure methanol, CH3OH, at 30 °C is 160. torr. How many grams of the nonvolatile solute glycerol, C3H5(OH)3, must be added to 131. g of methanol to obtain a solution with a vapor pressure of 133. torr?
If the activation energy for a given compound is found to be 42.0 kJ/mol, with a frequency factor of 8.0 × 1010 s-1, what is the rate constant for this reaction at 298 K?
An unknown sample of gas was put into a jar with a sample of nitrous oxide gas. The density of the gas is 1.098 g/L at 25 degree celcius when the atmospheric pressure is 756 torr.
Trichlorofluoromethane (CCl3F) boils at 23.8C, and its molar heat of vaporization is 24.8 kJ/mol. Calculate the molar entropy of evaporation of CCl3F(l).
The standardized perchloric acid solution is then used to titrate 41.10 mL of a solution of sodium lactate (NaC2H5OCOO). An endpoint is reached when 18.22 mL of perchloric acid has been added.
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