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2: 28.085 = 30x0.031 + 28x + 29y; 94.6%
3: B
4: A
5: C
6: A
7a: Relative atomic mass is the weighted average of the atomic mass of all an atom's naturally occurring isotopes.
7b: Relative atomic masses are obtained using a mass spectrometer. Draw a simple annotated diagram of the mass spectrometer.
8: 65x + 63y = 63.55 63Cu is 72.5% and 65Cu is 27.5%.
9: C
10i: The iron is ionized to more easily attract the iron atoms to the magnet.
10ii: A very low pressure is maintained inside the mass spectrometer to allow for easier atom movement and to reduce unwanted influences on atom movement.
11: B
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