ObsidianKnight3000idn
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A new element X is found and in the sample 70% has a mass number of 43, 25% is X-44, & 5% is X-47. What is the (average) atomic mass of this new element?

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Samueladesida43idn

The average atomic mass of this new element X is 43.45

HOW TO CALCULATE AVERAGE ATOMIC MASS:

  • The average atomic mass of an element can be calculated by the following steps:

  1. multiplying the atomic mass of each isotope with its relative abundance
  2. Then sum the results for each isotope

According to this question; a new element X is found and in the sample:

  1. 70% is X-43
  2. 25% is X-44
  3. 5% is X-47

The average atomic mass of element X is calculated thus:

X-43: 70/100 × 43 = 30.1

X-44: 25/100 × 44 = 11

X-47: 5/100 × 47 = 2.35

Next, we sum the results as follows:

= 30.1 + 11 + 2.35

= 43.45

  • Therefore, the average atomic mass of this new element X is 43.45.

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