So, I have currently written out my equation for H2O, this being (determining molar mass):

2x(1.01)+1x(16.00)

However the question also asks: "What is the mass, in grams, of 8.52 mol of the substance"

How would I carry this out? Please keep in mind I'm new to all of this so please go easy on me. If you don't get what I'm asking I'm basically asking if I would add on the 8.52 or something else.

Use units cancellation.

1 mole of a substance weighs 1 gram molecular mass of that substance.

So.....Find it out.

1 mole of a substance weighs 1 gram molecular mass of that substance.

So.....Find it out.

Wrong.

It's not question about protons (which have molar mass ~1.008 g/mol).

His/her question is about 8.52 mol of water molecules.

Hi Sensei, I can't understand from where you get protons. Please explain.

Hi Sensei, I can't understand from where you get protons. Please explain.

You said "1 mole of a substance weighs 1 gram molecular mass of that substance." which is true only exclusively for protons/antiprotons (as they have molar mass ~1.008 g/mol).

 

If you have water, molar mass 18.016 g/mol,

and you have 1 mole of water,

it has mass 18.016 grams.

For different molar mass and different moles, calculate by yourself.

 

BTW, protons are constituents of water. Two lonely protons (H), and 8 in Oxygen, but bound with usually 8 neutrons, in H₂O.

Edited November 14, 20169 yr by Sensei

Thanks...