Assume the isotope lthium-7 has a mass of 7.00 atomic mass units, and 92.5% abundance and the lsotope lithium-6 has a mass of 6.00 atomic mass units, and 7.5% abundance, what would be the average weighted mass for lithium ? (3 points) Write your answer to three decimal places followed by one space and units in small caps, for example (1.234 amu) not (1.234amu) or (1.234 amu) or (1.234 amu.) Romember the real answer box is not 0 but a empty space to type. 1 am using 0 as an example of an empty space where you hand type your