A gas mixture contains 75.2\% nitrogen and 24.8\% krypton by

pogonofor9z 2022-01-06 Answered
A gas mixture contains 75.2% nitrogen and 24.8% krypton by mass. What is the partial pressure of krypton in the mixture if the total pressure is 745 mm Hg?
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Expert Answer

hysgubwyri3
Answered 2022-01-07 Author has 43 answers

nN2= 75.2gN21molN228.0134gN2 Each percentage represents the number of grams of an element per 100.0 grams of that gas mixture. Convert these masses to moles using molar masses.
=2.6844molN2
nKr= 24.8gKr1molKr83.798gKr
=0.29595molKr
Use the mole fraction equation to determine the partial pressure of krypton
PKr=XKrPt
=(nKrnKr+nN2)Pt
=(0.29595mol0.29595mol+2.6844mol)(745mmHg)
=74.0mmHg

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Jeremy Merritt
Answered 2022-01-08 Author has 31 answers

Step 1
Given data
A gas mixture contains -
Nitrogen =75.2%
krypton =24.8%
total pressure is 745 mmHg.
Step 2
Solution-
calculate the mole fraction of the component-
Mole fraction of tha erypton —
X2=moles of the cryptontotal moles of the 3 gas mixture
X2=0.296mol(2.68+0.296)mol=0.0995
partial pressure of the crypton:
total pressure x mole fraction of the crypton
745mmHg×0.0995=74.12mmHg

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karton
Answered 2022-01-10 Author has 439 answers

Step 1
Given:
Mass of nitrogen =75.2 g (75.2% by mass)
Mass of krypton =24.8 g (24.8% by mass)
Total pressure =745 mm Hg
Step 2
To determine the partial pressure of krypton as follows,
Molar mass of nitrogen =28.02gmol
Calculating the moles of nitrogen using the formula,
n1=Mass of nitrogenMolar mass of nitrogen
=75.2g28.02gmol
=2.68mol
Molar mass of krypton =83.80gmol
Calculating the moles of krypton using the formula,
Mass of krypton
n2=Mass of kryptonMolar mass of krypton
=24.8g83.80gmol
=0.296mol
Step 3
To calculate the mole fraction of krypton,
Moles of krypton, X2=Moles of the cryptonTotal moles of gas mixture
=0.296mol(2.68+0.296)mol=0.0995
Partial pressure of krypton =Total pressure * Mole fraction of krypton
Substituting the values in the above formula,
Partial pressure of krypton =745mmHg*0.0995=74.1mmHg
Hence, the partial pressure of krypton in the given mixture is 74.1mmHg .

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