Silver calculating atomic mass

Identify a process to solve the problem. The question asks about the volume of one silver atom. Mass and volume are related through density p — mj V. From this equation, we can calculate the total volume of the silver atoms. The problem also gives the total number of silver atoms transferred from the wire to the spoon. The volume of a single atom is the total volume divided by the number of atoms. Oftentimes, a flow chart helps to summarize the process ... 

Problem 7 Listed in the following chart are the atomic weights (measured in atomic mass units) for natural silver and its two isotopes. Use this data to calculate the percentage of silver-109 in the natural mixture. 

A powder diffraction pattern establishes that silver crystallizes in a face-centred cubic unit cell. The 111 reflection is observed at 0=19.1°, using Cu-Ka radiation. Determine the unit cell length, a. If the density of silver is 10.5x10 kg m and Z=4, calculate the value of the Avogadro constant. (The atomic mass of silver is 107.9.)... 

Naturally occurring silver exists as two isotopes. From the mass of each isotope and the isotopic abundance listed below, calculate the average atomic mass of silver. 

O O You know that silver exists as two isotopes silver-107 and silver-109. However, radioisotopes of silver, such as silver-105, silver-106, silver-108, and silver-110 to silver-117 are known. Why do you not use the abundance and mass of these isotopes when you calculate the average atomic mass of silver Suggest two reasons. 

Naturally occurring silver is composed of two isotopes Ag-107 is 51.35% with a mass of 106.905092 amu, and the rest is Ag-109 with a mass of 108.9044757 amu. Calculate the average atomic mass of silver. 

Problem Silver (Ag Z = 47) has 46 known isotopes, but only two occur naturally, " Ag and Ag. Given the following mass spectrometric data, calculate the atomic mass of Ag ... 

In 1865 a chemist reported that he had reacted a weighed amoimt of pure silver with nitric acid and had recovered aU the silver as pure silver nitrate. The mass ratio of silver to silver nitrate was foimd to be 0.634985. Using only this ratio and the presently accepted values for the atomic weights of silver and oxygen, calculate the atomic... 

X-ray diffraction from crystals provides one of the most accurate ways of determining Avogadro s number. Silver crystallizes in a face-centered cubic lattice with all atoms at the lattice points. The length of an edge of the unit cell was determined by x-ray diffraction to be 408.6 pm (4.086 A). The density of silver is 10.50 g/cm. Calculate the mass of a silver atom. Then, using the known value of the atomic weight, calculate Avogadro s number. 

In any problem of this type where you have to calculate the mass of an atom, you can always check the vahdity of your answer by calculating the mass of a mole of atoms (the molar mass). For example, because the calculated mass of the silvCT atom in this problem is 1.791 X 10 g, the molar mass is (6.02 X 10 ) X (1.791 X 10 ) — 108 g/mol, which is the expected molar mass of silver to three significant figures. 

The silver chloride precipitate, which can be produced in a very pure form, is collected on a weighed filter crucible (Figure 18.4) and washed to remove extraneous residual salts. After drying to remove excess water, the crucible and the precipitate are weighed to get the mass of the precipitate and the percentage of chloride is calculated by stoichiometric calculation. Where the atomic mass of chloride is 35.45 g/mol and the molar mass of AgCl is 143.32 g/mol, the calculation is... 

Each mole of electrons that passes through the cell arises from the oxidation of j mol of Zn(s) (because each Zn atom gives up two electrons) and reduces 1 mol of silver ions. From the molar masses of silver and zinc, we calculate that 65.38/2 = 32.69 g of zinc is dissolved at the anode and 107.87 g of silver is deposited at the cathode. The same relationships hold if the cell is operated as an electrolytic cell, but in that case silver is dissolved and zinc is deposited. 

A button case for a small battery must be silver coated. The button is a perfect cylinder with a radius of 3.0 mm and a height of 2.0 mm. For simplicity, assume that the silver solution used for plating is silver nitrate. (Industrial processes often use other solutions.) Assume that the silver plating is perfectly uniform and is carried out for 3.0 min at a current of 1.5 A, (a) What mass of silver is plated on the part (b) How many atoms of silver have plated on the part (c) Calculate an estimate of the thickness (in atoms) of the silver coating. (Silver has a density of 10.49 g/cm and an atomic radius of 160 pm.)... 

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