We’re given the following values:
X-54: Mass = 53.93961 amu f.a. = 5.845 % ÷ 100 = 0.05845
X-56: Mass = 55.93494 amu f.a. = 91.75 % ÷ 100 = 0.91750
X-57: Mass = 56.93539 amu f.a. = 2.123 % ÷ 100 = 0.02123
X-57: Mass = 57.93328 amu f.a. = 0.2820% ÷ 100 = 0.00282
Average Atomic Mass = ??
A certain element X has four isotopes.
• 5.845% of X has a mass of 53.93961 amu.
• 91.75% of X has a mass of 55.93494 amu.
• 2.123% of X has a mass of 56.93539 amu.
• 0.2820% of X has a mass of 57.93328 amu.
What is the average atomic mass of element X?
Express your answer numerically to four significant figures.
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