Calculate the mass, in grams,of an atom of a substance with anatomic number of 2

Question

Calculate the mass, in grams,of an atom of a substance with anatomic number of 29 and a mass number of 65. A piece of thissubstance was placed in a graduated cylinder containing 24.50 mL ofwater and the volume increased to 39.36 mL. How many atoms werecontained in this piece, if the density of the substance is8.96g/mL? what is the substance? Can you please all work and explain.... Calculate the mass, in grams,of an atom of a substance with anatomic number of 29 and a mass number of 65. A piece of thissubstance was placed in a graduated cylinder containing 24.50 mL ofwater and the volume increased to 39.36 mL. How many atoms werecontained in this piece, if the density of the substance is8.96g/mL? what is the substance? Can you please all work and explain....

Explanation / Answer

We Know that :      Intial volume of the grduatedcylinder is = 24.50 ml      Final volume of the grduatedcylinder is = 39.36 ml       change in the volume in thecylinder is = ( 39.36 - 24.50 ) ml          Density ofthe substance is = 8.96 g / ml          Weight of thesubstance = density of the substance x change inthe volume                                                = 8.96 g / ml x 14.86 ml                                                  = 133.1456 gm           Number of atoms = weight of the substance / gram atomic weight of the substance x N                                         =   133.1456 gm / 65 gm / mole  x 6.023 x 1023                                         = 1.2337 x 1024 atoms           Fromthe mass number & Atomic number the element is Cu.                                         = 1.2337 x 1024 atoms           Fromthe mass number & Atomic number the element is Cu.

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