To find:
a) The moles of a gas in the sample.
b) the probable identity of the gas.
Answer to Problem 10.77QA
Solution:
a)
b) Probable gas present in the sample is Helium.
Explanation of Solution
1) Concept:
We are given the volume of the sample at different temperature at constant pressure
So, from the given temperature and volume, we can calculate the number of moles for each set of data and using the grams of sample, we can calculate the molar mass of the sample which will give us an idea about the probable identity of gas.
2) Formula:
3) Given data:
i.
ii.
iii.
4) Calculations:
The number of moles for each set of data are calculated:
Set 1:
From the first data set, we have
Set 2:
From the second data set, we have
Set 3:
From the third data set, we have
Set 4:
From the fourth data set, we have
Set 5:
From the fifth data set, we have
So, from the above calculations, it is clear that number of moles of the sample is
As molar mass of the unknown gas sample comes out to be
Conclusion:
The moles of gas for each set of data are calculated, and using the given mass, the molar mass of the gas is calculated. From this, the identity of the gas is determined.
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Chapter 10 Solutions
Chemistry: An Atoms-Focused Approach (Second Edition)
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