How many moles are in 3.89 x 1024 atoms of BID?

What is the molar mass of babr2? a. 217.2 g/mol b. 297.1 g/mol c. 354.5 g/mol d. 434.4 g/mol

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?