How many moles of H20 are contained in 4.21 x 1024 molecules of H2O? O A 2.53 x 1048 moles
OB. 2.34 x 1023 moles
C. 6.99 moles
OD. 0.143 moles

C. 6.99 moles

Explanation:

To convert molecules to moles we simply divide the given number of molecules by Avogadro's number, 6.022 x 10²³

Given number of molecules : 4.21 x 10^24

Number of moles : 4.21 x 10^24 / 6.022 x 10²³ = 6.99 moles ( rounded )

The answer is C