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प्रश्न
What is the significance of the formula H2O ?
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उत्तर
The significance of the formula H2O is:
It represents one molecule of water.
It provides important information on the constituents of water i.e. hydrogen and oxygen, through the chemical formula.
It also provides information on the number of atoms of each element present in one molecule of water.
It refers to the presence of one mole of molecules of water; it refers to 6.022 × 1023 molecules of water.
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संबंधित प्रश्न
Calculate the molecular mass of CH3OH.
Calculate the molecular mass of nitric acid, HNO3. (Atomic masses : H = 1 u ; N = 14 u ; O = 16 u)
Calculate the molecular mass of hydrogen bromide (HBr). (Atomic masses : H = 1 u ; Br = 80 u)
Calculate the molecular masses of the following compounds :
Carbon disulphide, CS2
(Atomic masses : H = 1 u ; S = 32 u ; C = 12 u)
Calculate the molecular masses of the following :
Carbon dioxide, CO2
(Atomic masses : H = 1 u ; O = 16 u ; Cl = 35.5 u ; N = 14 u ; C = 12 u)
Calculate the formula masses of the following compounds :
- Calcium chloride
- Sodium carbonate
(Given : Atomic masses : Ca = 40 u ; Cl = 35.5 u ; Na = 23 u ; C = 12 u; O = 16 u)
How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u)
From the equation
\[\ce{3Cu + 8HNO3 -> 3Cu(NO3)2 + 4H2O + 2NO}\]
(Atomic mass Cu = 64, H = 1, N = 14,O = 16)
Calculate the mass of copper needed to react with 63g of HNO3.
Calculate the molecular mass of the following:
Na2SO4.10H2O
Given atomic mass of Cu = 63·5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32
Calcium carbonate react with dilute hydrochloric acid as given below:
\[\ce{CaCO3 + 2HCl -> CaCl2 + H2O + CO2}\]
What is the mass of 5 moles of calcium carbonate? (Relative molecular mass of calcium carbonate is 100)
