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## Mole Concept (mass of 1 mole atom with respect to mass no. i.e. board diagram) Laga dege to ho jayega molecular mass Mass of 1 atom of x = [Mass no]amu = (atomic mass) Mass of 1 mole of x = (Mass no) gram = (molar atomic mass) i.e N = 19amu = mass of 1 atom of Na 1 gram = mole of 1 atom of Na...

## Mole Concept (mass of 1 mole atom with respect to mass no. i.e. board diagram) Laga dege to ho jayega molecular mass Mass of 1 atom of x = [Mass no]amu = (atomic mass) Mass of 1 mole of x = (Mass no) gram = (molar atomic mass) i.e N = 19amu = mass of 1 atom of Na 1 gram = mole of 1 atom of Na Mole concept or gram concept [1 mole = 6.022×1023/6×1023/NA] ### Problems * **Q. 3 gram atom of O has mass** * Mass of 3 mole atom = 3x16 = 48g * **Q. (CO2) 5 gram molecules of CO2** * 12+16 = 44amu (mass of 1 molecules of CO2) * 44 gram (mass of 1 mole molecules of CO2) * 5NA molecules of CO2 * 5NAx1 atom of CO2 * 5NAx2 atom of O2 * 44x5g gram * **Q. what is the mass of 0.5 mole of O2 molecules?** * O2 = 16×3 = 48g * 48×0.5 = 24g