Answer :
Common brass is a copper and zinc alloy.
it contains 37.0% zinc by mass and having a
density of 8.48 g/cm³. A fitting composed of
common brass has a total volume of 121.5 cm³
as per avove staement , we have got
mass of copper = 63%
density = 8.48 g/cm³
volume =121.5 cm³
now,
Mass of Fitting = Vol * Density = 8.48 * 121.5= 1030 gm.
Mass of copper = 63% of 958.24 = 603.7 gm.
Moles of copper = mass/Mol. wt. = 603.7/63.5 ; [Mol wt. of copper = 63.5]
= 9.507 moles.
Therefore, Atoms of Copper = Moles * NA = 9.507*6.022*10^23
= 5.725*10^24 atoms.
To know more about Moles visit :
https://brainly.com/question/26416088
#SPJ9
