Answer:
193.87
Explanation:
Use the equation:
Ar = [(isotope-1 % abundance x isotope-1 mass) + (isotope-2 % abundance x isotope-2 mass) + ...] / 100
=> [(47.3522 x 192.3097) + (8.6903 x 193.3213) + (0.9234 x 194.5534) + (43.03 x 195.7027)] / 100
or in this case, to be exact, you can add up all the % abundance, and you'll get around 99.9959, instead of dividing all the content in the parentheses by 100, you can use 99.9959 for a more exact answer, although the average atomic mass of the two won't have much of a noticeable difference.
