In a wetted-wall column, a study involving absorption of ammonia by water is conducted. The value of the overall mass transfer coefficient based on gas phase (KG) is found to be 2.8  10-6 kmol/m2 .s. kPa. At one point in the column, the gas and liquid phase compositions are measured to be 6.0 (yA, b) and 0.12 (xA, b) mole% NH3, respectively. The temperature (T) is 300K and the total pressure (P) is 1 atm. 90 % of the total resistance to mass transfer is found to be in the gas phase. At 300 K, ammonia– water solution follows Henry’s law upto 5 mole% ammonia in the liquid, with m = 1.5 when the total pressure is 1 atm. Calculate the flux of ammonia at the given point in the column (NA), individual film coefficients (kx, ky) and the interfacial concentrations (xA, i, yA, i). Interfacial concentrations lie on the equilibrium line.

they emit helium gas that attaches to nearby planets.

they remove low-mass elements from the planets’ crust.

they cause nuclear fusion inside the inner core of planets.

they produce heavy elements such as iron and gold.

explanation:

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

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