Question

Calculate the mass of 3.022 x 10 23 molecules of H2O

Answer 1

ANSWER: 327.81 grams

Explanation:

you want to be converting the number of moles of molecules of water you have into number of moles

We know that,

Number of particles=Number of moles×Avagadro's constant

therefore, number of moles=number of particles/avagadro's constant

3.022×10^23/6.02×10^23

=18.192

thus 18.192 moles

now, number of moles =mass/molar mass

thus mass=number of moles×molar mass

the mola mass of H2O is 18.02 g/mol

mass=18.192×18.02=327.81 grams