naturally occurring nitrogen has two isotopes n-14 and n-15 which isotopes has greater number of electrons explain according to 10 marks
Answers
Answer:
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Explanation:
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Answer:
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The percent abundance of N-15 is 0.6403%.
Explanation:
- The atomic mass of an element is a weighted average of its isotopes in which the sum of the abundance of each isotope is equal to 1 or 100%.
Formula for Calculating Isotope Percent Abundance
#(x)("mass") + (1-x)("mass")=100%#
In order to determine the percent abundance of nitrogen-15:
#"Let"#
#x="% of nitrogen-15"#
#(1-x)="% of nitrogen-14"#
#100%=14.0067#, the atomic mass of nitrogen
Set up the formula for nitrogen-15 and nitrogen-14.
#15.001x+14.00031(1-x)=14.0067#
Simplify the left-hand side.
#15.001x+14.00031-14.00031x=14.0067#
Simplify.
#0.9979x+14.00031=14.0067#
Subtract #14.00031# from both sides.
#0.9979x=14.0067-14.00031#
Simplify.
#0.9979x=0.00639#
Divide both sides by #0.9979#.
#x=0.006403xx100=0.6403% "nitrogen-15"#
In case you're interested, the percent abundance of nitrogen-14 is
#1-x=#
#1-0.006403=0.993597#
#0.993597xx100=99.3597% "nitrogen-14"#
#99.3597% + 0.6403%=100%#