A student has 27.8 grams of helium and requires 6,89 moles for an experiment. Does the sttdent have enough helium for the experiment? To solve this problem, find the number of moles in 27.8 grams and compare it to the 6.89 moles available to determine if the student has sufficient helium for the reaction.

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Case Study
A student has 27.8 grams of helium and reguires 6,89 moles for an experiment. Does me staden
have enough helium for the experiment?
To solve this problem, find the number of moles in 27.8 grams and compare it to the 6.89 motes
available to determine if the student has sufficient helium for the reaction.
I mole He
27.8 grams He x
= 6.95 moles He
4.00g He
Comparing the available 6.95 moles with the needed 6.89 moles, vou can conclude that the
student has enough He for the reaction, with 0.06 moles left over.
Note that the conversion factor between moles and grans can be expressed two ways:
I mole
atomic mass in grams
or
atomic mass in grams
1 mole
How do you know which conversion factor to use? Consider which unit you need and how units
cancel in a setup. If you need to know the numb
in the numerator (on top). If you need to kmow the number of grams, use the conversion factor
with grams in the numerator.
of moles, use the convers
factor with moles
to ie
CHEM 40 LAB MANUAL 2019 - 2020
Page 156
Transcribed Image Text:Case Study A student has 27.8 grams of helium and reguires 6,89 moles for an experiment. Does me staden have enough helium for the experiment? To solve this problem, find the number of moles in 27.8 grams and compare it to the 6.89 motes available to determine if the student has sufficient helium for the reaction. I mole He 27.8 grams He x = 6.95 moles He 4.00g He Comparing the available 6.95 moles with the needed 6.89 moles, vou can conclude that the student has enough He for the reaction, with 0.06 moles left over. Note that the conversion factor between moles and grans can be expressed two ways: I mole atomic mass in grams or atomic mass in grams 1 mole How do you know which conversion factor to use? Consider which unit you need and how units cancel in a setup. If you need to know the numb in the numerator (on top). If you need to kmow the number of grams, use the conversion factor with grams in the numerator. of moles, use the convers factor with moles to ie CHEM 40 LAB MANUAL 2019 - 2020 Page 156
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