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grimsnightmare
 one year ago
Change mass to number of particles;
How many molecules does 36.0 grams of water represent?
I know this is a two step problem, 1  mass to moles, 2  moles to particles. I am having some problems understanding the information provided to me. is 36.0g the molar mass of H2O? And if it's not I am having problems finding it for hydrogen and oxygen. Please help.
grimsnightmare
 one year ago
Change mass to number of particles; How many molecules does 36.0 grams of water represent? I know this is a two step problem, 1  mass to moles, 2  moles to particles. I am having some problems understanding the information provided to me. is 36.0g the molar mass of H2O? And if it's not I am having problems finding it for hydrogen and oxygen. Please help.

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.036.0 gram is not the molar mass. Molar mass of H2O is 18 so mole=mass/molar mass is the formula 36/18 will give you the moles now for particles just multiply the moles by avogadro's number.

grimsnightmare
 one year ago
Best ResponseYou've already chosen the best response.0How did you find the 18?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0H2O atomic masses of both elements H and O are given in the periodic Table. O has 16 and H has 1. There are two atoms of H in a compound so 2×1= 2 g. 16 + 2= 18g. Molecular mass is the mass of no. Of all atoms of elements in a compound.

grimsnightmare
 one year ago
Best ResponseYou've already chosen the best response.0Alright. Thank you very much for the help.

grimsnightmare
 one year ago
Best ResponseYou've already chosen the best response.0I was just confused because in an example I was provided, we were working on step one problem. C6H12O6 and it was written "If you find the mass of a sample of glucose to be 90.0g, how many moles of glucose is there. She said carbon= 12.0g * 6, hydrogen = 1.01g * 12, Oxygen = 16.6 * 6. then all the final answers put together equaled 180.1g or 180g(1.80 * 10^2 g). Then making the final answer 0.500 moles. Because mass=90.0 and molar mass was 180.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So now you know what they're saying right whenever they say mass it's not the same thing as molar mass. Whenever i get these type of questions i just work out the molar mass just to be sure.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0If they're going to give you the molar mass of a compound they're sure going to write molar mass. And not just mass/mass of a sample.

grimsnightmare
 one year ago
Best ResponseYou've already chosen the best response.0yes and thank you for clearing that up for me. I didn't realize how much the question made sense until just now haha. However I am still confused how my teacher 16.6 for oxygen. I only get 16.0 when rounding.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oxygen has 15.999 g in periodic tables 16.6 is wrong because rounding it up will give 17.0. By rounding 15.999 we get 16.0 we do it for simplicity.

grimsnightmare
 one year ago
Best ResponseYou've already chosen the best response.0That's what I thought. Thank you again for the help

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0can you have a look at my question.that would be a great help. :)
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