Advertisements
Advertisements
प्रश्न
Calculate the formula masses of the following compounds :
Calcium carbonate
उत्तर
Atomic mass of aluminium = 27 u
Atomic mass of oxygen = 16 u
Formula mass of Al2O3 can be calculated as follows:
Formula mass of Al2O3 = Mass of two Al atoms + Mass of three O atoms
= 2 × 27 + 3 × 16
= 54 + 48
= 102
Therefore, the formula mass of Al2O3 is 102 u.
APPEARS IN
संबंधित प्रश्न
Calculate the molecular mass of O2.
Calculate the molecular mass of NH3.
Calculate the molecular masses of the following :
- Hydrogen, H2
(Atomic masses : H = 1 u ; O = 16 u ; Cl = 35.5 u ; N = 14 u ; C = 12 u)
Calculate the molecular mass of nitric acid, HNO3. (Atomic masses : H = 1 u ; N = 14 u ; O = 16 u)
How many molecules are present in one gram molecular mass of a substance ?
If sulphur exists as S8 molecules, calculate the number of moles in 100 g of sulphur. (S = 32 u)
A gas cylinder of capacity of 20 dm3 is filled with gas X the mass of which is 10 g. When the same cylinder is filled with hydrogen gas at the same temperature and pressure the mass of the hydrogen is 2 g, hence the relative molecular mass of the gas is ______.
Calculate the molecular mass of the following:
Potassium Chlorate.
At mass : C = 12, H = 1, O = 16, Cl = 35.5, N = 14, Cu = 63.5, S = 32, Na = 23, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24]
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
What is the SI prefix for each of the following multiples and submultiples of a unit?
- 103
- 10–1
- 10–2
- 10–6
- 10–9
- 10–12
