Question

How can we calculate the Relative Atomic mass of an element with the mass of a hydrogen atom
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Answer 1

Answer:

Relative atomic mass equals the mass of an atom of an element (here, Hydrogen) divided by one-twelfth mass of an atom of C-12.

One twelfth mass of C-12 is nothing but 1/12 of its mass number (12) = 1.

And the mass of an atom of Hydrogen = 1.6736x10^-24 g.

Relative atomic mass would then ve equal to the mass of an atom of hydrogen itself since the denominator is 1. i.e. = 1.67X10^-24 g.

In terms of amu,

1 amu = 1.66x10^-24g,

the mass would be

1.6736x10^-24g/1.66x10^-24g = 1.0078 amu = 1.0080 amu.

Answer 2

Answer:

You can always find the relative mass of an element by adding the number of protons to the number of neutrons for the specific isotope of the element you're considering. For example, a carbon-12 atom has 6 protons and 6 neutrons, and so has a relative atomic mass of 12.