MU_360038.a

The two active ingredients of this sunscreen lotion are octyl methoxycinnamate and 4-methylbenzylidene camphor.

Both protect our skin through absorbing damaging UV-B radiation. (to see label close up, look at MU_360038.b).

 

octyl methoxycinnamate:

IUPAC name: 2-ethylhexyl (E)-3-(4-methoxyphenyl)prop-2-enoate

Molecular formula: C18H26O3

Concentration in this sunscreen: 99.0mg/mL = 99.0g/L

Molecular weight: 290.4g/mol

n=m/M

=99/290.4

=0.341mol

So concentration is 0.341mol/L

 

4-methylbenzylidene camphor:

IUPAC name: (3E)-1,7,7-Trimethyl-3-[(4-methylphenyl)methylene]-2-norbornanone

Molecular formula: C18H22O

Concentration in this sunscreen: 39.6mg/mL = 39.6g/L

Molecular weight: 254.4g/mol

n=m/M

=39.6/254.4

=0.156mol

So concentration is 0.156mol/L

Done