Average atomic mass = 11.6 amu
11.6 = 10 * 0.1 + 11 * x + 12 * 0.7
x = (11.6 - 1 - 8.4)/ 11
x = 0.2
Q-11 isotope is of 20% abundance
Is Q11 20%?? I’m not sure. e average atomic mass of unknown element Q is 11.6...
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