Fastguy Posted January 20, 2007 Share Posted January 20, 2007 Ok, I understand that mole is 6.02x 10^23. My teacher gave me this question Moles of Sodium Barcarbonate in a teaspoon Mass of Teaspoon: 10.02g Mass of Teaspoon of Sodium Bicarbonate: 20.19g Sodium Bicarbonate: NaHCO3 what is the mole, molecules, and oxygen atoms. Could someone please explain to me how to do this.I really don't understand Link to comment Share on other sites More sharing options...
Klaynos Posted January 20, 2007 Share Posted January 20, 2007 well 1 mole is the number you stated, molecules of the substance in this case NaHCO3, so you need to work out the mass of one molecule, the mass of all the molecules of that in the teaspoon and then from that you have too masses, total mass of molecules and mass of one mole. So if we use a bit of an annolgy of apples in a box, where 1 apple is 1 mole, some apples in a box, the mass of the apples is 10Kg, 1 apple is 1Kg, how many apples are there... Link to comment Share on other sites More sharing options...
Fastguy Posted January 21, 2007 Author Share Posted January 21, 2007 There are 10 apples in that box. Did I get it right? Ok from what you said I need to find the mass of one molecule, the total mass, and then the mass of one mole. Well I if I subtract the two numbers given I get the total mass of just the Sodium Bicarbonate alone 20.19g-10.02g= 10.17g I'm guessing that from that number, I need to divide something from it to get the mass of one molecule, right? How do I do that tho? Also, how do you find the mass of mole. I thought mole (itself) was just a number or unit. Could you be possibly be talking about moles of SB in a teaspoon. I'm sorry if I'm being confusing, I'm just trying to understand Link to comment Share on other sites More sharing options...
Asian Posted January 21, 2007 Share Posted January 21, 2007 u need the molar mass to convert to mols, and use dimensioanl analysis Link to comment Share on other sites More sharing options...
Fastguy Posted January 21, 2007 Author Share Posted January 21, 2007 I don't understand Link to comment Share on other sites More sharing options...
Asian Posted January 21, 2007 Share Posted January 21, 2007 the molar mass is the total wieght of the molecule. u then need to divide by that in order to convert to mols of w/e substance u are looking to find Link to comment Share on other sites More sharing options...
Asian Posted January 21, 2007 Share Posted January 21, 2007 and 6.023*10^23 u use that if u want to convert to molecules, particles ,etc. Link to comment Share on other sites More sharing options...
mercuryv8 Posted January 29, 2007 Share Posted January 29, 2007 Molar mass of NaHCO3 Na = 22.99g/mol X 1 H = 1.01g/mol x1 C = 12/02g/mol X1 O = 16.00g/mol X 3 Molar mass NaHCO3 = 84.02 g/mol (1mol / 84.02g) * 10.17g = 0.12 Moles NaHCO3 Link to comment Share on other sites More sharing options...
chemilover Posted February 12, 2007 Share Posted February 12, 2007 hello you r too fast in order to understand mole u pick the wrong concept mole is actually a molecular mass or atomic mass of a molecule or an atom expressed in grams and 6.02x10^23 is the no. of molecules or no. of atoms per mole for mole u can find out from the equation of disociation of NaHCO3 it would be three moles of oxygen now no of moles=mass/mol mass no of molecules = Avogadros no.(6.02x10^3)x mass of substance/molecular mass no of atoms = Avogadro's n0x mass of sub/atomic mass simple now i think your problem is solved u can ask more freely:-) Link to comment Share on other sites More sharing options...
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