Two isotopes of copper occur naturally:

isotopes of copper: percent abundance: atomic mass:
copper - 63 69.17 % 62.9396 amu
copper - 65 30.83 % 64.9278 amu
calculate the average atomic mass for the two isotopes of copper. answer to 4 decimal places.

Average atomic mass of copper = 63.5525 amu.

Explanation:

Abundance of Cu⁶³ = 69.17%

Abundance of Cu⁶⁵ = 30.83%

Atomic mass of Cu⁶³ = 62.9396 amu

Atomic mass of Cu⁶⁵ = 64.9278 amu

Average atomic mass = ?

Solution:

Average atomic mass of copper = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass of copper= ( 62.9396×69.17)+(64.9278×30.83) /100

Average atomic mass of copper=  4353.5321 + 2001.7240 / 100

Average atomic mass of copper = 6355.2561 / 100

Average atomic mass of copper= 63.5525 amu.

precipitation

explanation:

when it goes from cloud to rain/back to earth in the form of rain

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.