Calculate the atomic mass of gallium if gallium has 2 naturally occurring isotopes with the following masses and natural abundances:
Ga-69 68.9256 amu 60.11%
Ga-71 70.9247 amu 39.89%
A) 69.72 amu
B) 69.93 amu
C) 70.00 amu
D) 69.80 amu
E) 70.68 amu
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