CuriousStudent Posted November 6, 2016 Share Posted November 6, 2016 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. Link to comment Share on other sites More sharing options...
BabcockHall Posted November 11, 2016 Share Posted November 11, 2016 Use units cancellation. Link to comment Share on other sites More sharing options...
Sriman Dutta Posted November 12, 2016 Share Posted November 12, 2016 1 mole of a substance weighs 1 gram molecular mass of that substance. So.....Find it out. Link to comment Share on other sites More sharing options...
Sensei Posted November 12, 2016 Share Posted November 12, 2016 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. Link to comment Share on other sites More sharing options...
Sriman Dutta Posted November 14, 2016 Share Posted November 14, 2016 Hi Sensei, I can't understand from where you get protons. Please explain. Link to comment Share on other sites More sharing options...
Sensei Posted November 14, 2016 Share Posted November 14, 2016 (edited) 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, 2016 by Sensei Link to comment Share on other sites More sharing options...
Sriman Dutta Posted November 15, 2016 Share Posted November 15, 2016 Thanks... Link to comment Share on other sites More sharing options...
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