Percent Composition & Finding Formula - Chemistry

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SUMMARY

The discussion focuses on determining the formula of a sulfide formed from a reaction between sulfur and iron. The initial quantities are 50.0g of sulfur and 100.0g of iron, with 12.5g of iron remaining after the reaction. Participants emphasize the importance of converting the masses to moles and finding the ratio of moles of sulfur consumed to moles of iron consumed to derive the atomic ratio, which directly translates to the chemical formula of the sulfide. The use of calculators for simplifying ratios is also mentioned as a practical approach.

PREREQUISITES
  • Understanding of mole concept in chemistry
  • Knowledge of stoichiometry
  • Familiarity with chemical formulas and ratios
  • Basic calculator skills for fraction conversion
NEXT STEPS
  • Learn how to convert grams to moles using molar mass
  • Study stoichiometric calculations in chemical reactions
  • Explore the use of the ->frac command on scientific calculators
  • Investigate common sulfide formulas and their properties
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Chemistry students, educators, and anyone interested in understanding chemical reactions and stoichiometry in inorganic chemistry.

Larrytsai
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% Composition & Finding Formula - Chemistry

50.0g of Sulphur is mixed with 100.0g of iron and heated strongly. When the reaction is complete 12.5g of iron remains. What is the formula of sulphide formed?

duno where to start
 
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Convert everything to moles. Find the ratio of (moles sulphur consumed) to (moles iron consumed). That should give you the atomic ratio of sulphur to iron in the sulphide, which translates easily to a formula.

In general, "convert everything to moles" is a good first step.
 
Kalirren said:
Convert everything to moles. Find the ratio of (moles sulphur consumed) to (moles iron consumed). That should give you the atomic ratio of sulphur to iron in the sulphide, which translates easily to a formula.

hmmm kk well where i get lost is when i divide the moles.
What i would do is divide big/small and get a decimal number but i don't knw how to convert that into a fraction
 
Generally, if you did the problem correctly, a pretty obvious and easily recognizable ratio of small whole numbers will turn out. Just do it and then see.

Admittedly, I always just used the ->frac command on my calculator.
 

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