Question

The atomic mass unit is presently based on assigning an exact integral mass (in amu) to an isotope of an hydrogen oxygen sodium carbon helium
a. hydrogen

b. oxygen

c. sodium

d. carbon

e. helium

Answer 1

Carbon is the reference taken to assign the atomic mass unit

• One twelfth of the mass of unbound carbon-12 is taken as 1amu
• The unit for the atomic mass constant is Dalton (Da)
• This unit is standard when doing calculations in chemistry and physics
• 1amu = 1.6605x10⁻¹⁹g
• This was also derived from the law of definite proportions
• This standard has been set by the International Union of Pure and Applied Chemistry (IUPAC)
• The IUPAC is responsible for assigning various standards such as the nomenclature of various compounds, and updating the periodic table of elements.
• According to the IUPAC carbon is the reference taken to assign the atomic mass unit

Learn more about atomic mass units here:

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Answer 2

Answer: a. hydrogen

This is a fact.