Advertisements
Advertisements
प्रश्न
What is meant by the ‘molar mass’ of a substance ? State the unit in which molar mass is usually expressed.
उत्तर
Molar mass of a substance (molecular compound) is the mass in grams, numerically equivalent to the sum of atomic masses of individual atoms in the molecular formula of that substance.
Molar mass of a substance is usually expressed as grams/mole.
APPEARS IN
संबंधित प्रश्न
Calculate the molecular masses of the following compounds :
Carbon disulphide, CS2
(Atomic masses : H = 1 u ; S = 32 u ; C = 12 u)
Calculate the formula masses of the following compounds :
Calcium carbonate
Calculate the molecular mass of the following:
Mg3N2
Given atomic mass of Cu = 63·5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32
Calculate:
The gram molecular mass of chlorine if 308cm3 of it at STP weighs 0.979 g.
Calculate the weight/mass of an atom of hydrogen.
Calculate the relative molecular mass of ZnCO3.
Calcium carbonate is decomposed on heating in the following reaction
CaCO3 → CaO + CO2
How many moles of CO2 are there in this equation?
The mass of one steel screw is 4.11g. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth (5.98 × 1024kg). Which one of the two is heavier and by how many times?
What are ionic and molecular compounds? Give examples.
Write the formulae for the following and calculate the molecular mass for each one of them.
- Caustic potash
- Baking powder
- Limestone
- Caustic soda
- Ethanol
- Common salt
