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Gold forms a substitutional solid solution with silver. Compute the weight percent of gold that must be added to silver to yield an alloy that contains 6.5 × 1021 Au atoms per cubic centimeter. The densities of pure Au and Ag are 19.32 and 10.49 g/cm3, respectively. Also, the atomic weights for gold and silver are 196.97 and 107.87 g/mol, respectively.
What mass of helium gas is needed to pressurize a 112.0 L tank to 262 atm at 25°C?
Calculate the pH of a buffer solution made by adding .83 g of sodium acetate trihydrate [(NaC2H3O2)-3 H20] to 50 ml of .100 M acetic acid
What are some advantages of supercritical CO2 as a mobile phase for chromatographic separations
The molar heat of solution of a substance is found to be +35.34 kJ/mol. The addition of 0.20 moles of this substance to 1.5 L water initially at 55 degrees Celsius results in a temperature DECREASE
Calculate the 'size' of a hydrogen atom in its ground state according to this definition. Go on to explore how the 'size' varies as the definition is changed to other precentages, and plot your conclusion.
A pipette is used to add 32 mL of 0.2 M Pb(NO3)2 to a 261.0 mL solution of 0.3 M NaF. Determine the equilibrium concentration of Pb2+(aq) in the final solution. Ksp(PbF2)=3.6E-8.
Sodium borohydride is a strong base as well as a reducing agent. Why would it be better to add the NaBH4 solution to a base-sensitive substrate
A quantity of gas under a pressure of 1.78 atm has a volume of 550 cm square. the pressure is increased 2.50atm while the pressure remains constant what is the new volume.
The radius of a tungsten atom is 137 pm. How many tungsten atoms would have to be laid side by side to span a distance of 3.90 mm
Give a detailed mechanism for the nitration of bromobenzene . As part of your answer explain the regiospecificity
describe the hybrid orbitals uses by the central atom and the types of bonds formed in
a solution of 8.32g of paba in 150g of chloroform boiled at 62.62C. what is the molecular mass of paba?
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