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21.Element X (At no.12) has three Isotopes.The table gives mass numbers of each isotope and its percentage abundance in a sampleof element X.Mass Number 24 25 26Percentage Abundance (%)79 10 11Calculate the relative atomic mass of element X. |
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Answer» Answer: u1= 24 % of u1=79% u2= 25 % of u2= 10% u3= 26 % of u3= 11% relative ATOMIC mass= ( u1×%+ u2×%+ u3×%) = 24×79/100+ 25×10/100+ 26×11/100 =18.96+2.5+2.86 =24.32 u |
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