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Calculate the enthalpy of reaction for the combustion of methane gas, CH4 to form CO2(g) + H20(l)
Determine the enthalpy change for the oxidation of ethanol to acetic acid, CH3CH2OH() + O2(g) -> CH3COOH() + H2O() given the thermochemical equations below.
how many grams of sodium lactate must be added to a 1.00l solution of .400m lactic acid to make a buffer with a ph of
A certain weak base has a Kb of 7.80 × 10-7. What concentration of this base will produce a pH of 10.16
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.508g/L at 25C and 721mmHg?
The hydrogen atom can absorb light of wavelength 2626 nm. (a) In what region of the electromagnetic spectrum is this absorption found? (b) Determine the initial and final values of n associated with this absorption. initial
how many calories are used to heat a 50g sample of water from 8.1 degrees celius to 27.4 degrees celcius?
At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.00. What is the Ksp of the salt at 22 °C
An aqueous solution of weak base B of unknown concentration is titrated with a known concentration of acid, HA. Write the balanced chemical equation for this acid-base
Which is more dense, Argon or Xenon? Assumente temperature and pressure are constant. Explain.
A 2.01 g sample of a salt dissolves in 9.10 g of water to give a saturated solution at 25°C. What is the solubility (in g salt/100 g of H2O) of the salt?
Write the correct equation for the ready formation of a metallic deposit on placing a Ni(s) strip into 0.1 M copper nitrate.
You use 27.5 mL of NaOH to titrate 100.0 mL of HCl and 18.4 mL of NaOH to titrate 50.0 mL of 0.0782 M H2SO4. What are the concentrations of the HCl and NaOH respectively?
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