fix moles 16O calculation

[AgnieszkaZaba]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.62%. Comparing base (ccc8ef4) to head (1333ece).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1758   +/-   ##
=======================================
  Coverage   86.62%   86.62%           
=======================================
  Files         413      413           
  Lines       10471    10470    -1     
=======================================
  Hits         9070     9070           
+ Misses       1401     1400    -1     

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[slayoo]

@AgnieszkaZaba, let's move into this PR the new test_moles routine from #1757 - aiming at having here a test that fails without the introduced changes, and aiming at stripping #1757 of surplus changes

[AgnieszkaZaba]

@AgnieszkaZaba, let's move into this PR the new test_moles routine from #1757 - aiming at having here a test that fails without the introduced changes, and aiming at stripping #1757 of surplus changes

I'm working on it!