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Class 10 > Learn Science > Find the molecular mass of H2O.
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Find the molecular mass of H2O.

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Maths Trainer with 23 years of experience

ATOMIC MASS OF H=1 ATOMIC MASS OF O=16 SO, MOLECULAR MASS OF H2O: (2x1+16)=2+16=18g
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Educator having 8 years of experience in Teaching industry and M.Sc., B.Ed., CTET qualified.

Atomic mass of H=1u Atomic mass of O=16u Now, for H2O there are 2 Hydrogens and 1 oxygen So multiply the mass of Hydrogen with 2, mass of Oxygen with 1 and add both 1*2+16*1=2+16=18
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18 g/mol
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Molecular mass of H2O=2 × Atomic Mass of H+Atomic Mass of O=2+16=18 a.m.u OR H2O: The molecular mass of water, H2O = (2 × Atomic mass of hydrogen) + (1 × Atomic mass of oxygen) = = 2.016 u + 16.00 u = 18.016 = 18.02 u
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Molecular mass of H2O=2 × Atomic Mass of H+Atomic Mass of O=2+16=18 a.m.u
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Molecular mass of H2 = 1*2 g = 2g; Molecular mass of O = 16g; So, Molecular mass of H2O = (2 + 16)g = 18g
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molecular mass of H2O = 2 x atomic mass of Hydrogen + atomic mass of Oxygen = 2 x 1 + 16 = 18 a.m.u
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18
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18
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Maths Tutions by IITian

1 mole O and 2 moles H would mean 16g plus 2g. Hence the molecular mass will be 18gm
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