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Given a molecular equation string determine its atomic weight.

Limited atoms of C H O N and S where wts are rounded to [12 1 16 14 32].

Example molecules and wts:

CH4 16; CH3OH 32; O2 32; C6H6 78; H2SO4 98; radical SO4 96;

**Input:** Molecular Eqn [string with no spaces, all Caps]

**Output:** Molecular Wt [approx wt]

**Source:**

Saw this as a question on Matlab Answers.

28 correct solutions
11 incorrect solutions

Last solution submitted on Apr 24, 2015

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1 Comment

Richard Zapor
on 2 Sep 2013

Another astounding solution by Alfonso. A symbolic solution with regexprep using an expert logical twist to accommodate all molecules.

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