Class 9 Exam > Class 9 Questions > If isotopic distribution of C-12 and C-14 are...
Start Learning for Free
If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon is
- a)1.032 x 1022
- b)6.886 × 1023
- c)3.88 x 1022
- d)1.302 x 1022
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If isotopic distribution of C-12 and C-14 are 98% and 2% respectively,...
In 12 g of carbon, the amount of C-14
= 12 × 2/100 = 0⋅24g
∴ C-14 atoms in 0.24g = (0⋅24×6⋅02×1023)/14
= 1⋅03×1022 atoms.
= 12 × 2/100 = 0⋅24g
∴ C-14 atoms in 0.24g = (0⋅24×6⋅02×1023)/14
= 1⋅03×1022 atoms.
Free Test
FREE
| Start Free Test |
Community Answer
If isotopic distribution of C-12 and C-14 are 98% and 2% respectively,...
To calculate the number of C-14 atoms in 12 g of carbon, we first need to determine the number of moles of carbon in 12 g.
The molar mass of carbon (C) is approximately 12 g/mol. Therefore, the number of moles of carbon in 12 g is:
12 g / 12 g/mol = 1 mol
Next, we need to determine the number of moles of C-14 in 1 mol of carbon. Since the isotopic distribution of C-14 is 2%, this means that for every 100 carbon atoms, 2 of them are C-14. Therefore, the number of moles of C-14 in 1 mol of carbon is:
2% * 1 mol = 0.02 mol
Finally, we can calculate the number of C-14 atoms in 12 g of carbon by multiplying the number of moles of C-14 by Avogadro's number (6.022 x 10^23 atoms/mol):
0.02 mol * 6.022 x 10^23 atoms/mol = 1.2044 x 10^22 atoms
Rounding to three significant figures, the number of C-14 atoms in 12 g of carbon is approximately 1.20 x 10^22 atoms.
Therefore, option a) 1.032 x 10^22 is the closest answer.
The molar mass of carbon (C) is approximately 12 g/mol. Therefore, the number of moles of carbon in 12 g is:
12 g / 12 g/mol = 1 mol
Next, we need to determine the number of moles of C-14 in 1 mol of carbon. Since the isotopic distribution of C-14 is 2%, this means that for every 100 carbon atoms, 2 of them are C-14. Therefore, the number of moles of C-14 in 1 mol of carbon is:
2% * 1 mol = 0.02 mol
Finally, we can calculate the number of C-14 atoms in 12 g of carbon by multiplying the number of moles of C-14 by Avogadro's number (6.022 x 10^23 atoms/mol):
0.02 mol * 6.022 x 10^23 atoms/mol = 1.2044 x 10^22 atoms
Rounding to three significant figures, the number of C-14 atoms in 12 g of carbon is approximately 1.20 x 10^22 atoms.
Therefore, option a) 1.032 x 10^22 is the closest answer.
|
Explore Courses for Class 9 exam
|
|
Similar Class 9 Doubts
Top Courses for Class 9View all
If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer?
Question Description
If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer?.
If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer?.
Solutions for If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 9.
Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free.
Here you can find the meaning of If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer?, a detailed solution for If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon isa)1.032 x 1022b)6.886 × 1023c)3.88 x 1022d)1.302 x 1022Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 9 tests.
|
|
Explore Courses for Class 9 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup