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Which of the following is correct definition of a mole?
A. It is equal to the gram atomic mass of the substance
B. It contain 6.022×1020 atoms of a given substance
C. It is equal to gram molecular mass of the substance
D. It contain 6.022×1023 molecules of a given substance
A. It is equal to the gram atomic mass of the substance
B. It contain 6.022×1020 atoms of a given substance
C. It is equal to gram molecular mass of the substance
D. It contain 6.022×1023 molecules of a given substance
- a)(a) and (b) are correct
- b)(a), (c) and (d) are correct
- c)(b) and (c) are correct
- d)All of these
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which of the following is correct definition of a mole?A. It is equal ...
Definition of a mole:
- The correct definition of a mole is option B: It contains 6.022×10^23 atoms of a given substance.
Explanation:
- The mole is a unit of measurement used in chemistry to represent a specific amount of a substance.
- It is defined as the amount of a substance that contains the same number of entities (atoms, molecules, ions, etc.) as there are atoms in 12 grams of carbon-12.
- The number of entities in a mole is known as Avogadro's number, which is approximately 6.022×10^23.
- Therefore, a mole represents a specific quantity of a substance, regardless of its atomic or molecular mass.
- The correct definition of a mole is that it contains 6.022×10^23 atoms of a given substance, as stated in option B.
Incorrect options:
A. It is equal to the gram atomic mass of the substance:
- This is not the correct definition of a mole. The gram atomic mass is the mass of one mole of atoms of an element, but it does not define what a mole is.
C. It is equal to the gram molecular mass of the substance:
- This is not the correct definition of a mole. The gram molecular mass is the mass of one mole of molecules of a compound, but it does not define what a mole is.
D. It contains 6.022×10^23 molecules of a given substance:
- This statement is incorrect because a mole can contain atoms, molecules, ions, or any other entities, not just molecules.
- The correct definition of a mole is option B: It contains 6.022×10^23 atoms of a given substance.
Explanation:
- The mole is a unit of measurement used in chemistry to represent a specific amount of a substance.
- It is defined as the amount of a substance that contains the same number of entities (atoms, molecules, ions, etc.) as there are atoms in 12 grams of carbon-12.
- The number of entities in a mole is known as Avogadro's number, which is approximately 6.022×10^23.
- Therefore, a mole represents a specific quantity of a substance, regardless of its atomic or molecular mass.
- The correct definition of a mole is that it contains 6.022×10^23 atoms of a given substance, as stated in option B.
Incorrect options:
A. It is equal to the gram atomic mass of the substance:
- This is not the correct definition of a mole. The gram atomic mass is the mass of one mole of atoms of an element, but it does not define what a mole is.
C. It is equal to the gram molecular mass of the substance:
- This is not the correct definition of a mole. The gram molecular mass is the mass of one mole of molecules of a compound, but it does not define what a mole is.
D. It contains 6.022×10^23 molecules of a given substance:
- This statement is incorrect because a mole can contain atoms, molecules, ions, or any other entities, not just molecules.
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Which of the following is correct definition of a mole?A. It is equal ...
Calculation of Oxygen atoms in CaCO3:
To determine the number of oxygen atoms present in 300 grams of CaCO3, we need to follow these steps:
Step 1: Calculate the molar mass of CaCO3
- The molar mass of one Ca atom = 40.08 g/mol
- The molar mass of one C atom = 12.01 g/mol
- The molar mass of three O atoms = 3 x 16.00 g/mol
- Total molar mass of CaCO3 = 40.08 + 12.01 + 3(16.00) = 100.09 g/mol
Step 2: Calculate the number of moles in 300 grams of CaCO3
- Number of moles = Mass / Molar mass
- Number of moles = 300 g / 100.09 g/mol = 2.998 moles
Step 3: Calculate the number of oxygen atoms
- In one molecule of CaCO3, there are 3 oxygen atoms
- Number of oxygen atoms = 3 x Avogadro's number x Number of moles
- Number of oxygen atoms = 3 x 6.022 x 10^23 x 2.998
- Number of oxygen atoms = 54.207 x 10^23
Therefore, there are 54.207 x 10^23 atoms of oxygen present in 300 grams of CaCO3. Hence, the correct answer is option 'A'.
To determine the number of oxygen atoms present in 300 grams of CaCO3, we need to follow these steps:
Step 1: Calculate the molar mass of CaCO3
- The molar mass of one Ca atom = 40.08 g/mol
- The molar mass of one C atom = 12.01 g/mol
- The molar mass of three O atoms = 3 x 16.00 g/mol
- Total molar mass of CaCO3 = 40.08 + 12.01 + 3(16.00) = 100.09 g/mol
Step 2: Calculate the number of moles in 300 grams of CaCO3
- Number of moles = Mass / Molar mass
- Number of moles = 300 g / 100.09 g/mol = 2.998 moles
Step 3: Calculate the number of oxygen atoms
- In one molecule of CaCO3, there are 3 oxygen atoms
- Number of oxygen atoms = 3 x Avogadro's number x Number of moles
- Number of oxygen atoms = 3 x 6.022 x 10^23 x 2.998
- Number of oxygen atoms = 54.207 x 10^23
Therefore, there are 54.207 x 10^23 atoms of oxygen present in 300 grams of CaCO3. Hence, the correct answer is option 'A'.
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Which of the following is correct definition of a mole?A. It is equal to the gram atomic mass of the substanceB. It contain 6.022×1020atoms of a given substanceC. It is equal to gram molecular mass of the substanceD. It contain 6.022×1023molecules of a given substancea)(a) and (b) are correctb)(a), (c) and (d) are correctc)(b) and (c) are correctd)All of theseCorrect answer is option 'B'. Can you explain this answer?
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Which of the following is correct definition of a mole?A. It is equal to the gram atomic mass of the substanceB. It contain 6.022×1020atoms of a given substanceC. It is equal to gram molecular mass of the substanceD. It contain 6.022×1023molecules of a given substancea)(a) and (b) are correctb)(a), (c) and (d) are correctc)(b) and (c) are correctd)All of theseCorrect answer is option 'B'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Which of the following is correct definition of a mole?A. It is equal to the gram atomic mass of the substanceB. It contain 6.022×1020atoms of a given substanceC. It is equal to gram molecular mass of the substanceD. It contain 6.022×1023molecules of a given substancea)(a) and (b) are correctb)(a), (c) and (d) are correctc)(b) and (c) are correctd)All of theseCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct definition of a mole?A. It is equal to the gram atomic mass of the substanceB. It contain 6.022×1020atoms of a given substanceC. It is equal to gram molecular mass of the substanceD. It contain 6.022×1023molecules of a given substancea)(a) and (b) are correctb)(a), (c) and (d) are correctc)(b) and (c) are correctd)All of theseCorrect answer is option 'B'. Can you explain this answer?.
Which of the following is correct definition of a mole?A. It is equal to the gram atomic mass of the substanceB. It contain 6.022×1020atoms of a given substanceC. It is equal to gram molecular mass of the substanceD. It contain 6.022×1023molecules of a given substancea)(a) and (b) are correctb)(a), (c) and (d) are correctc)(b) and (c) are correctd)All of theseCorrect answer is option 'B'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Which of the following is correct definition of a mole?A. It is equal to the gram atomic mass of the substanceB. It contain 6.022×1020atoms of a given substanceC. It is equal to gram molecular mass of the substanceD. It contain 6.022×1023molecules of a given substancea)(a) and (b) are correctb)(a), (c) and (d) are correctc)(b) and (c) are correctd)All of theseCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct definition of a mole?A. It is equal to the gram atomic mass of the substanceB. It contain 6.022×1020atoms of a given substanceC. It is equal to gram molecular mass of the substanceD. It contain 6.022×1023molecules of a given substancea)(a) and (b) are correctb)(a), (c) and (d) are correctc)(b) and (c) are correctd)All of theseCorrect answer is option 'B'. Can you explain this answer?.
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