Advertisements
Advertisements
प्रश्न
Deduce the number of molecules of the following compound in the given quantity.
90g water
Advertisements
उत्तर
Number of moles in water = `"Mass of water in grams"/"Molecular mass of water"`
= `90/18`
= 5 moles
∴ 5 moles of H2O contains = 5 × 6.022 × 1023 molecules = 30.11 × 1023 molecules.
The number of molecules in 90 grams of water is 3.01 × 1024.
APPEARS IN
संबंधित प्रश्न
Calculate the molar mass of the following substance:
Ethyne, C2H2
Convert into mole.
20 g of water
What name is given to the amount of substance containing 6.022 × 1023 particles(atoms,molecules or ions) of a substance ?
What is the mass of 0.2 mole of oxygen atoms ?
Fill in the following blanks :
64 g of oxygen gas contains ................ moles of oxygen atoms.
Calculate the mass in grams of 0.17 mole of hydrogen sulphide, H2S. (Atomic masses : H = 1 u, S = 32 u)
Calculate the mole ratio of 240 g of calcium and 240 g of magnesium. (Ca = 40 u ; Mg = 24 u)
What weight of each element is present in 1.5 moles of sodium sulphite, Na2SO3 ?
(Atomic masses : Na = 23 u ; S = 32 u ; O = 16 u)
How many moles of oxygen atoms are present in one mole of the following compounds ?
- Al2O3
- CO2
- Cl2O7
- H2SO4
- Al2(SO4)3
Which of the following correctly represents 360 g of water ?
- 2 moles of H2O
- 20 moles of water
- 6.022 × 1023 molecules of water
- 1.2044 × 1025 molecules of water
The relative atomic mass of Cl atom is 35.5 a.m.u. Explain this statement.
A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10-12 g. Calculate the number of carbon atoms in the signature.
The equation for the burning of octane is:
\[\ce{2C8H18 + 25O2 -> 16CO2 + 18H2O}\]
How many moles of carbon dioxide are produced when one mole of octane burns?
Complete the following calculations. Show working for complete credit :
Calculate the mass of calcium that will contain the same number of atoms as are present in 3.2 gm of Sulphur. [Atomic masses : S = 32, Ca = 40]
Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)
What is the value of molar volume of a gas at S.T.P?
Calculate the number of moles of CO2 which contain 8.00 g of O2
What mass of Ca will contain the same number of atoms as are present in 3.2 g of S?
Correct the statement, if required.
The relative atomic mass of an element is the number of times one molecule of an element is heavier than `1/12` the mass of an atom of C12.
