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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: tinypleco on March 14, 2009, 05:46:57 PM

Title: Stoichiometry question. Calculating Amount of Atoms.
Post by: tinypleco on March 14, 2009, 05:46:57 PM

Hey everyone, I have a couple questions that look like this:

"The empirical formula of styrene is CH; the molar mass of styrene is 104.14 g/mol. What number of H atoms are present in a 4.50 g sample of styrene?"

You don't need to fully solve it for me. I just need to know the process. Thank you so much for any help that you can give me.

Title: Re: Stoichiometry question. Calculating Amount of Atoms.
Post by: Arkcon on March 14, 2009, 06:16:14 PM

Can you figure out the absolute chemical formula for styrene? For example, what is the molar mass of the empirical formula, CH?  How is it different from the actual molar mass?

Title: Re: Stoichiometry question. Calculating Amount of Atoms.
Post by: ARGOS++ on March 14, 2009, 06:17:47 PM

Dear tinypleco;

Three question as a Hint for you:
      1.     How many H's in one molecule styrene?
      2.     How many molecules per mole?
      3.     How many moles styrene are 4.5 g?

Good Luck!
                    ARGOS⁺⁺