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On p. 40 it was pointed out that mass and energy are alternate aspects of a single entity called massenergy. The relationship between these two physical quantities is Einstein's famous equation, $E=m c^{2}$ where $E$ is energy, $m$ is mass, and $c$ is the speed of light. In a combustion experiment, it was found that $12.096 \mathrm{g}$ of hydrogen molecules combined with $96.000 \mathrm{g}$ of oxygen molecules to form water and released $1.715 \times 10^{3} \mathrm{kJ}$ of heat. Calculate the corresponding mass change in this process and comment on whether the law of conservation of mass holds for ordinary chemical processes. (Hint: The Einstein equation can be used to calculate the change in mass as a result of the change in energy. $1 \mathrm{J}=1 \mathrm{kg} \mathrm{m}^{2} / \mathrm{s}^{2}$ and $c=3.00 \times 10^{8} \mathrm{m} / \mathrm{s}$

1.9055*10^-8 g

Chemistry 101

Chapter 2

Atoms, Molecules, and Ions

Atoms, Molecules and Ions

University of Central Florida

Rice University

Brown University

University of Toronto

Lectures

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On p. 43 it was pointed ou…

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In Section 2.1 it was poin…

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On page 36 it was pointed …

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One of the most famous eq…

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Certainly one of the most…

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Einstein's mass-energ…

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The relationship between m…

So we have cable this equation e goes to EMC squared in this equation. E is the energy released with respect from us, and I m is changed him us and C is the speed off, lads. Okay, so we have given that, um, you have compassion experiments, sick, tough points, Onan. Six grams of hash. Monica's combined with 96 grams of acting Michael's to form water and released 1.715 times 10 to 30. Kahlo draws off. Hit. So energy is equal to a 1.715 times 10 to the third characters, which he goes to has converged be unit to Jules. Okay? And we are going to calculate the mass that mass change Italy's combustion process. Okay, so on Yukos Need, you know, I dated by say, spread display peeling the members we got the changing mass is one Quinn's now they were 55 times 10 to the connective ace grunts. Well, this is a very small change, Red. So, um, it says that Zeev act the effect of formation of product will be negligible because the changing mass we calculated from this Einstein question is very small. Therefore, law of conservation of mass hosts cracked for chemical reactions

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