ashantila ashantila
  • 30-01-2021
  • Chemistry
contestada

been stuck on this question for more than 10 mins. can someone pls help i’m frustrated ‍♂️.

been stuck on this question for more than 10 mins can someone pls help im frustrated class=

Respuesta :

ardni313
ardni313 ardni313
  • 31-01-2021

The average atomic mass : 15.86

Further explanation

Given

205 atoms = 16 amu⇒atom 1

15 atoms = 14 amu⇒atom 2

Required

The average atomic mass

Solution

Total atoms for element Z :

= 205 + 15

= 220 atoms

% atom 1 = 205/220 x 100% = 93.18%

% atom 2 = 15/220 x 100% = 6.82%

The average atomic mass :

= 93.18% x 16 amu + 6.82% x 14 amu

= 14.9088 + 0.9548

= 15.8636≈ 15.86( 4 sig fig)

Answer Link

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