You have 1.20 x 10 24 molecules of H2O. What is the mass of this sample?

Explanation:

In this case, we have to remember that relationship between the avogadro's number and the "mol" concept:

With this in mind, we can do the first conversion:

Now, if we calculate the molar mass of . The atomic mass of O is 16 g/mol and the atomic mass of H is 1 g/mol, so:

(16*1)+(1*2)= 18 g/mol

In other words, , so:

I hope it helps!

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.