A chemistry problem by A Former Brilliant Member

Chemistry Level 2

By mass, what percentage (to 1 decimal place) of carbon disulfide ( CS 2 \text{CS}_{ 2 } ) is carbon?


The answer is 15.8.

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A Former Brilliant Member by A Former Brilliant Member

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1 solution

Mass of carbon disulfide = 32 + 32 + 12 32+32+12 = 76 76

12 ÷ 76 12\div 76 = 0.157 0.157

0.158 ∗ 100 % 0.158*100\% = 15.7 % \boxed{15.7\%}

3 Helpful 0 Interesting 0 Brilliant 0 Confused

Isn't the molecular mass of carbon (approximately) 12?

Calvin Lin Staff - 6 years, 11 months ago

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Good point, it is. It's fixed now. My brain must have been thinking of Oxygen for some reason haha.

A Former Brilliant Member - 6 years, 11 months ago

Woah Calvin you know something about chemistry? :O What else are you good at?

Finn Hulse - 6 years, 11 months ago

Nice that the correct answer is 15.8 (better than 15.7).

If we increase the precision you used:

(12.0107 u) / (12.0107 u + 2 * 32.065 u) = 0.157743

Also, 12 / 72 = 0.16666... != 0.157. Right?

And... With all due respect, check you sum "(32 + 32 + 12)". @Thomas Jones

Bernardo Sulzbach - 6 years, 11 months ago

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