Q2.4CYL
Question
A sample of magnesium is found to contain 78.70% of 24Mg atoms (mass 23.98 amu), 10.13% of 25Mg atoms (mass 24.99 amu), and 11.17% of 26Mg atoms (mass 25.98 amu). Calculate the average mass of a Mg atom.
Step-by-Step Solution
Verified Answer
24.31 amu
1Step1: Given
- 78.70% of 24Mg atoms (mass 23.98 amu),
- 10.13% of 25Mg atoms (mass 24.99 amu), and
- 11.17% of 26Mg atoms (mass 25.98 amu)
2Step 2: Average mass
( 0.7870 x 23.98) + (0.1013 x 24.99) + (0.1117 x 25.98)
= 18.87 + 2.537 + 2.896
= 24.297 amu ~ 24.3 amu
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