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Class 11 Chemistry Practice Test: Basic Concepts of Chemistry - Atomic and Molecular Masses
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The atomic mass unit (u) is a unit that describes the masses of individual atoms and molecules. The atomic mass is the weighted average of the masses of all isotopes of an element. The molecular mass is the sum of the masses of the atoms in a molecule.

Class 11 Chemistry Practice Test: Basic Concepts of Chemistry - Atomic and Molecular Masses
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10 Questions

1. As, per the current system, carbon-12 has been taken as the standard for measuring atomic masses.
2. Calculate the molecular mass of sucrose(C12H22O11) molecule?
3. Calculate the average atomic mass of nitrogen present in the atmosphere?
ISOTOPEABUNDANCEATOMIC MASS
14N99.69%14.0031 amu
15N0.39%15.0001 amu
4. What’s the molecular mass of carbon dioxide?
5. A sample of carbon that contains 70% carbon-12 and 30% carbon-14. What do you think is the average atomic mass of this sample?
6. ______ is the sum of atomic masses of the elements present in a molecule.
7. What is the mass of hydrogen in terms of amu?
8. What’s the formula mass of NaCl?
9. What is the abbreviation of amu?
10. Nowadays, “amu” is replaced by ____

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