Advertisements
Advertisements
प्रश्न
The mass of one molecule of a substance is 4.65 × 10–23 g. What is its molecular mass ? What could this substance be ?
Advertisements
उत्तर
Given:
Mass of one molecule of a substance = 4.65 × 10-23
We know that the mass of a molecule of a substance is equal to the mass of 1 mole of that substance. 1 mole of a substance consists of 6.022 × 1023 molecules; therefore, the mass of a molecule of a substance is equal to the mass of 6.022 × 1023 molecules.
Therefore, to calculate the molecular mass of the substance, we need to calculate the mass of 6.022 × 1023 molecules of that substance.
Mass of 1 molecule of the substance = 4.65 × 10-23
Mass of 6.022 × 1023 molecules of the substance = 6.022 × 1023 × 4.65 × 10-23 = 28g
Hence, molecular mass of the substance is 28 u.
Nitrogen has a molecular mass of 28 u; therefore, the substance is nitrogen.
APPEARS IN
संबंधित प्रश्न
Calculate the molecular mass of CH3OH.
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 molecular masses of the following compounds :
Methane, CH4
(Atomic masses : C = 12 u ; H = 1 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)
Define gram molecular mass of a substance. How much is the gram molecular mass of oxygen ?
Calculate the molecular mass of the following:
CH3COONa
[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]
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 relative molecular mass of ZnCO3.
Molar mass of CO2 is 42g.
Write the name of the following compound and deduce its molecular mass.
NaOH
