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Acetylene burns in air according to the following equation. C2H2(g) + 5/2 O2(g) 2 CO2(g) + H2O(g) H0rxn = -1255.8 kJ Given that H0f of CO2(g) = -393.5 kJ/mol and H0f of H2O(g) = -241.8 kJ/mol, what is H0f of C2H2(g)?
Calculate the ratio of ionized to unionized drug forms that would exist in the plasma at physiological pH (7.4). What is the percent ionized to unionized
Find the mass fraction and mole fraction of each component, the molar mass of mixture, and it's gas constant.
Why is lactose much more soluble in water than in ethanol?
In the DNA double helix, adenine forms three hydrogen bonds with thymine D) In the DNA double helix, cytosine forms three hydrogen bonds with guanine
An insulated tank contains half liquid and half vapor by volume in equilibrium. The release of a small quantity of vapor without the addition of heat will cause
Zinc metal is produced by the reaction of its oxide with carbon monoxide at high temperature. The equlibrium constant for the equation
Microwave ovens emit microwave energy with a wavelength of 12.2 cm. What is the energy of exactly one photon of this microwave radiation
When 0.0017 moles of a weak acid are dissolved in enough water to make 0.500 L, the pH of the resulting solution is 5.97. Calculate Ka.
calculate the molarity of phosphoric acid in a solution that is 84% by mass phosphoric acid and has a dentisty of 1.87 g/m.
hydrochloric acid for neutralization. A 12.0mL volume of a phosphoric acid solution requires 35.1mL of the sodium hydroxide solution for complete neutralization.
the substitution reaction of (2R)-2-bromopentane and CH3O- undergoes substitution with NaOCH3.
Calculate the maximum amount of thorium ion that could be present in a waste water, if it is made 0.1500 M in oxalate ion. Assume the oxalate is present in stoichiometric amount, compared to the thorium.
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