SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The mass exactly equal to
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weight
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atomic mass
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relative atomic mass
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None of the above
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Explanation:
Detailed explanation-1: -AMU is defined as one-twelfth the mass of an atom of carbon-12 (12C). C is the most abundant natural carbon isotope, accounting for over 98% of carbon found in nature. It has an AMU of 12.
Detailed explanation-2: -Atomic mass is based on a relative scale and the mass of 12C (carbon twelve) is defined as 12 amu; so, this is an exact number.
Detailed explanation-3: -The AMU was defined by John Dalton to be 1/12 the mass of a carbon atom. Since carbon has 12 individual units (6 neutrons and 6 protons, neglecting electrons), an AMU is essentially the mass of either a single proton or neutron.
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