How many moles are in 8.6x10^26 molecules of H2O expressed in the correct number of significant figures?

Question

A. 1,400 mil h2o

B. 5.2x10^50 mol h2o

C. 1.4 mol h20

D. 1.4x10^51 mol h2o

Answer 1

Since there are 2 sig figs in the given (8.6 x 10²⁶) then we must round the answer to 2 sig figs. 1428 moles becomes 1400 moles of H₂O