NY Regents Chemistry Exam August 2023 Question 32
32 The table below gives the atomic mass and the abundance of the two naturally occurring isotopes of copper.
Which numerical setup can be used to calculate the atomic mass of the element copper?
(1) (62.93 u)(30.85) + (64.93 u)(69.15)
(2) (62.93 u)(69.15) + (64.93 u)(30.85)
(3) (62.93 u)(0.3085) + (64.93 u)(0.6915)
(4) (62.93 u)(0.6915) + (64.93 u)(0.3085)
Solution: To calculate the atomic mass of an element we have to take the atomic mass of each isotope, multiply it by the percent abundance in the decimal form and add them up. Choice 4 is correct.
Choice 3
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