Question

How many molecules are in 7 g of H2O

Answer 1

2.342*10^23

Step-by-step explanation:

# of molecules = Moles * NA

# of molecules = (Mass in grams) / (Molar Mass) * NA

Molar Mass of H2O = 18g/mol

Avogadro's number(NA) = 6.022*10^23

Now,

# of molecules = (7g/18gmol)*(6.022*10^23) = 2.342 * 10^23

Answer 2

0.38

Explanation:its right bc it is