Problem

The molar mass of caffeine is $194.19 \mathrm{g}$…

Problem 58 Easy Difficulty

The empirical formula of a compound is CH. If the molar mass of this compound is about $78 \mathrm{g},$ what is its molecular formula?

Answer

Topics

Intro to Chemistry

Atoms, Molecules and Ions

Composition

Book Cover for Chemistry 1st

Chemistry 1st

Chapter 3

Stoichiometry: Ratios of Combination

Discussion

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Top Chemistry 101 Educators

Nadia L.

Rice University

Stephen P.

Drexel University

Morgan S.

University of Kentucky

JH

Jacquelin H.

Brown University

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Video Transcript

So for this problem, we're supposed to find the molecular formula of a compound, given that it's molar mass 78 grams per mole and that its empirical formula ch. In other words, this question is just asking how many ch is conf it into our compound, the final compound. And the first thing that we need to do is we need to find the molar mass of our empirical formula, or ch. Well, we know that for one mole of carbon, well, the masses 12 point no. One grams and you're that for hydrogen. It's 1.0, wait grams per mole of hydrogen. And so we get that the total more mass is just 13 0.2 grams promote. And so we know that the molecular mass is 78 grams per mole or the molar mass of the entire compound. You just divide a 13.2, and we see that roughly we'll get that. The answer. Six. In other words, six ch is fit in our final compound, so the only thing we need to do is multiplied each of these by six. So you get six moles of carbon and six moles of because There is only one in each year, and so obviously the final compounds can formula is just see six each six, and that is a final answer.

Daniel K.

Topics

Intro to Chemistry

Atoms, Molecules and Ions

Composition

Book Cover for Chemistry 1st

Chemistry 1st

Chapter 3

Stoichiometry: Ratios of Combination

Top Chemistry 101 Educators

Nadia L.

Rice University

Stephen P.

Drexel University

Morgan S.

University of Kentucky

JH

Jacquelin H.

Brown University