If 100 atoms of element X contains 70 atoms of 9X and 30 atoms of 11X, calculate the relative atomic mass of X

Assessment: WAEC SSCE - Chemistry - 2009 (Objective) Subject: Chemistry

Question 1 Report

If 100 atoms of element X contains 70 atoms of ⁹X and 30 atoms of ¹¹X, calculate the relative atomic mass of X

9.6

10.6

11.6

20.0

Answer Details

To calculate the relative atomic mass of X, we need to take into account the mass and abundance of each isotope of X. We know that element X has two isotopes: ⁹X and ¹¹X. To calculate the relative atomic mass of X, we can use the formula: Relative atomic mass of X = (mass of ⁹X x % abundance of ⁹X) + (mass of ¹¹X x % abundance of ¹¹X) / 100 Substituting the values we have, we get: Relative atomic mass of X = (9 x 70) + (11 x 30) / 100 Relative atomic mass of X = 630 + 330 / 100 Relative atomic mass of X = 9.6 Therefore, the relative atomic mass of X is 9.6.

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If 100 atoms of element X contains 70 atoms of 9X and 30 atoms of 11X, calculate the relative atomic mass of X

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