How many cu atoms are present in a piece of sterlingsilver jewelry weighing 33.24 g ? (sterling silver is a silver–copper alloy containing 92.5% ag by

The mass of piece of sterling silver jewelry is 33.24 g. It contains 92.5% silver Ag by mass. Since, sterling silver is an alloy of Ag-Cu thus, percentage of Cu will be:

% Cu=100-92.5=7.5%

Thus, mass of copper will be:

Molar mass of Cu is 63.546 g/mol, thus, number of moles of Cu can be calculated as follows:

Here, m is mass and M is molar mass.

Putting the values,

Now, in 1 mole of Cu there are thus, in 0.03923 mol, number of Cu atoms will be:

Thus, number of atoms of Cu will be.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

answerambulatory;