Question

A sample of carbon contained 98.90% carbon- 12 and 1.10% carbon- 13. Calculate the relative
atomic mass of carbon in the sample. Give your answer to two decimal places. ​

Answer 1

Answer:

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Explanation:

• 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.

Answer 2

Answer:

          12.01 g

Explanation:

Isotopes     Isotopic mass    % Abundance

   ¹²C                   12                        98.9

  ¹³C                  13                         1.10

Average Atomic Mass = (12 × 98.9) + (13 × 1.1) / 98.9 + 1.1

                                     = 1186.8 + 14.3 / 100

                                     = 1201.1 / 100

                                = 12.01 g