Question

how many moles of water H2O contain 2.0 x 10^22 molecules of water? express the quantity in moles to two significant figures

Answer 1

1 mole ------------- 6.02x10²³ molecules
?? moles ---------- 2.0x10²² molecules

( 2.0 x 10²² ) x 1 / 6.02x10²³ => 0.0332 moles of water