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A mixture of oxygen and hydrogen is examined by passing it over hot copper oxide and through a drying tube. Hydrogen reduces the CuO to metallic Cu. Oxygen then reoxidizes the copper back to CuO. We know that 100 cm3 of the mixture measured at 25oC and 750 mm yields 84.5 cm3 of dry oxygen measured at 25oC and 750mm after passage over CuO as well as the drying agent. Explain what is the original composition of the mixture? State balanced chemical equation for the reactions
What would be the potential in volts of a standard hydrogen (S.H.E.) electrode under the following conditions?:
The ionization energy for potassium is 419 \rm kJ/mol. The electron affinity for bromine is -325 \rm kJ/mol. Use these values and Hess's law to calculate the enthalpy for the following reaction:
silver has two stable isotopes with masses of 106.90509 amu and 108.9047 amu. the average molar mass of silver is
the vapor of a volatile liquid is able to fill a 408-mL flask at 100.4C and 765mm Hg, what is the molar mass of the liquid?
A chemist dissolves 284 mg of pure potassium hydroxide in enough water to make up 140 mL of solution. Calculate the pH of the solution.
Assuming this particle is a single crystal, how many unit cells are lined up across the diameter of the particle? d. Calculate the mass of the particle. e. Approximately how many atoms does this particle contain?
ou are asked to make a 500-g rod with the zn-cu-al-sn alloy of 80 at. zn 5 at. cu 10 at. al. 5 at. sn. how many
Given Ka values of 1.0 x 10-10 and 6.8 x 10-8 for C6H5OH and C5H5NH+ respectively, calculate the equilibrium constant for the following reaction.
Why is the pka of formaldehyde less than acetaldehyde, a regular aldehyde or a ketone? Why is it a stronger acid compare to these other structures?
Consider the following chemical equation. A) Fe2O3(l) + Al(l) --> Fe(l) + Al2O3(s) If 25.0 g of molten iron(III) oxide reacts with 475 g of aluminum, what is the mass of the iron produced
Assume that the maximum number of ATP's is produced (38). At pH 7, and in the presence of excess Mg2+
Explain why do gas bubbles when rising through a liquid get bigger. Is it for the reason that of the molecules that are bouncing around inside the bubbles are hitting the sides within or else bouncing off one another which would make them expand
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