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

The average atomic mass : 15.86

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)

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants