Question

ASSERTION:the standard unit for expressing the mass of atom is amu REASON:amu stands for mass of 1 atomo carbon​

Answer 1

Answer: Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Explanation: The standard unit for expressing the mass of an atom is amu (atomic mass unit).

It is equal to 1/12 of the mass of an atom of carbon-12 equal to 1.6605×10^−19  g.  

amu is also called as avogram.

Avogram is a unit of mass and weight equal to one gram divided by the Avogadro's number.

Thus, Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Answer 2

Answer:

Assertion is correct but the reason is wrong.

Explanation:

1. An amu (atomic mass unit) if defined as the 1/12th of the mass of an atom of Carbon-12. Carbon 12 atom consists of 6 protons and 6 neutrons in its nucleus.

2. An amu is measured in Daltons (D).

3. Atomic mass of an element is referred to as an average mass of the atoms of an element which is measured in atomic mass unit.

4. Atomic mass unit is also called as unified atomic mass unit (u).

1 amu = Average of the proton rest mass and the neutron rest mass

1 amu = 1.67377 × 10-27kg

OR

1 amu = 1.67377 × 10-24gram

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