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1) Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction isZn2+(aq)+2e??Zn(s)For a large batch of nails, a manufacturer needs to plate a total zinc mass of 2.50kg on the surface to get adequate coverage.How many moles of zinc are in 2.50kg of zinc?
2) The total charge of a mole of electrons is 96,500 coulombs (C) and1ampere(A)=1coulomb/second(C/s)Part A) What mass of Cu(s) is electroplated by running 21.0A of current through a Cu2+(aq) solution for 4.00 h?Part B) How many minutes will it take to electroplate 56.1g of gold by running 5.00 A of current through a solution of Au+(aq)?
3) What mass of gold is produced when 6.90A of current are passed through a gold solution for 10.0min ?
Ethanol (C2H5OH) melts at -114 °C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K, respectively.
find the molarity of 0.5 grams of sodium chloride is dissolved to make 0.05 ml of solution
The double-replacement reaction between silver nitrate and sodium bromide produces silver bromide, a component of photographic film. (A) If 4.50mol of silver react, what mass of sodium bromide is required?
1) How many moles of oxygen atoms are present in a sample that contains 3.86 moles of dioxygen difluoride O2F2? The answer I got from this was: 7.72 moles of O2 atoms?
A room with dimensions 7.00m by 8.00m by 2.50m is to be filled with pure oxygen at 22.0C and 1.00atm . The molar mass of oxygen
A solution is prepared by mixing 250 mL of 1.00 M CH3COOH with 500 mL of 1.00 M NaCH3COO.
Determine the boiling point of a solution of 22.5 g of fructose, C6H12O6 , in 294 g of phenol.
Indicate the hybridization for each carbon and nitrogen atom in this molecule, then draw an orbital overlap picture for the molecule.
What mass of sucrose should be combined with 541 of water to make a solution with an osmotic pressure of 8.30 at 295 ? (Assume the density of the solution to be equal to the density of the solvent.)
Calculate the mass percent of a solution that is prepared by adding 61.4 g of rm NaOH to 413 g of {rm H_2O}.
What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself.
A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.30 nm. It then gives off a photon having a wavelength of 1820 nm
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