Advertisements
Advertisements
प्रश्न
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
Calcium carbonate
Advertisements
उत्तर
Molar mass of CaCO3 = 40 + 12 + 3(16) = 100 g/mol
Number of moles of a substance = `"Mass of the substance in grams"/"Molecular mass of the substance"`
Let Mass of the substance in grams be x,
`0.2 = "x"/100 = 20`g
we need, 20 g of CaCO3 for obtaining 0.2 moles of CaCO3.
APPEARS IN
संबंधित प्रश्न
What is the mass of 1 mole of nitrogen atoms?
Convert into mole.
20 g of water
What is the mass of 0.5 mole of water molecules?
Calculate the percentage of water of crystallization in CuSO4.5H2O
(H = 1, O = 16, S = 32, Cu = 64)
One of the following elements has an atomicity of ‘one’. This element is :
Fill in the following blanks :
A mole represents an .............. number of particles of a substance.
Fill in the blank
One gram atom of an element contains ______ atoms.
Calculate the weight of one molecule of oxygen.
[Avogadro’s number = 6 × 1023, O = 16 ]
A flask contains 3.2g of sulphur dioxide.Calculate the following : The moles of sulphur dioxide present in the flask.
What is the value of molar volume of a gas at S.T.P?
Define the term:
Mole
Find the number of molecules in 73 g of HCl.
Find the number of moles in 10 g of CaCO3.
Calculate the mass of 0.1 mole of the following:
Na2SO4.10H2O
(Ca = 40, Na = 23, Mg = 24, S = 32, C = 12, Cl = 35.5, O = 16, H = 1)
A student puts his signature with a graphite pencil. If the mass of carbon in the signature is 10-12 g, calculate the number of carbon atoms in the signature.
Calculate the number of oxygen atoms in 0.10 mole of Na2CO3 . 10H2O.
Calculate the number of moles in 7g of nitrogen.
How many grams are there in the following?
4 moles of the phosphorous molecule, P4
Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 225 g of pure HgS? Molar mass of Hg and S are 200.6 g mol–1 and 32 g mol–1 respectively.
Deduce the number of molecules of the following compound in the given quantity.
90g water
