Question

How many molecules make 18 grams of $H_{2}O$?

• A. $12.044\ast {10}^{23}$
• B. $1.2044\ast {10}^{24}$
• C. $0.6022\ast {10}^{24}$
• D. None of the choice

Answer 1

The correct option is C

$0.6022\ast {10}^{24}$

$6.022\ast {10}^{23}$

18 grams of water makes exactly one mole of the substance and one mole of any substance contains $6.022\ast {10}^{23}$ particles. 1 mole of a substance is defined to be the amount of the substance containing as many atoms, molecules, ions, electrons or other elementary entities as there are carbon atoms in 12 grams of Carbon.