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The mass of a molecule of water is...

The mass of a molecule of water is

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`"Molecular mass of" H_(2)0 = 18 amu`
Weight of `6.02 xx 10^(23)` molecules of water= 18g
`"Weight of one"= (18)/( 6.02 xx 10^(23))= 2.99 xx 10^(23)`
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In chemistry, 'mole' is an essential tool for the chemical calculations. It is a basic SI unit adopted by the 14^(th) general conference on weights and measurements in 1971. A mole contains as many elementary particles as the number of atoms present in 12 g of ""^(12)C . 1 mole of a gas at STP occupies 22.4 litre volume. Molar volume of solids and liquids is not definite. Molar mass of a substance is also called gram-atomic mass or gram molecular mass. The virtual meaning of mole is plenty, heap or the collection of large numbers. 1 mole of a substance contains 6.022 xx 10^(23) elementary particles like atom or molecule. Atomic mass unit (amu) is the unit of atomic mass, e.g., atomic mass of single carbon is 12 amu. The mass of one molecule of water is approximately

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AAKASH INSTITUTE-SOME BASIC CONCEPT OF CHEMISTRY-ASSIGNMENT( SECTION - D) Assertion-Reason Type Questions
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  2. A: 1 "a.m.u." = 1.66 xx 10^(-24) gram. R: Actual mass of one atom of...

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  3. A: Unit of specific gravity is gram-"cc"^(-1) R: Specific gravity i...

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  4. A: Number of atoms in 2 mole of NH(3) is equal to number of atoms in 4...

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  5. A: In the reaction 2NaOH + H(3)PO(4) to Na(2)HPO(4) + 2H(2)O equi...

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  7. A: One mole of sucrose-reacts completely with oxygen produces 268.8 li...

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  8. A: In the reaction, 2NaOH+H(2)SO(4) to Na(2)SO(4) + 2H(2)O equival...

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  9. A: When 4 moles of H(2) reacts with 2 moles of O(2), then 4. moles of ...

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  10. A: 50 ml, decinormal HCl when mixed with 50 ml, decinormal H(2) SO(4),...

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  11. A : 50 ml, decimolar H(2) SO(4) when mixed with 50 ml, decimolar NaOH,...

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  12. A : Ratio of empirical formula mass and molecular formula mass must be...

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  14. A: 1 gram of salt in 1 m^(3) of solution has concentration of 1 ppm. ...

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  16. A: Number of ions in 9 gram of NH(4)^(+) is equal to Avogadro's number...

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