According to this formula when:
ΔG = ΔH - TΔS = 0
∴ ΔS = ΔH/T
∴ ΔS = n*ΔHVap / Tvap
- when n is the number of moles = mass/molar mass
when the mass = 24.1 g
and the molar mass = 187.3764 g/mol
by substitution:
∴ n = 24.1 / 187.3764g/mol
= 0.129 moles
and ΔHvap is the molar enthalpy of vaporization is 27.49 kJ/mol
and Tvap is the temperature in Kelvin = 47.6 + 273 = 320.6 K
So by substitution, we will get the ΔS the change in entropy:
∴ΔS = 0.129 mol * 27490 J/mol / 320.6 K
= 11 J/K
Answer:
The fourth one down
Explanation:
It is the only setup in which the units of "cm" and "in" cancel correctly and give the desired units of "ft."
The second one down has the correct units but the wrong conversion factor for converting centimetres to inches.
The metal with the highest melting point is aluminium which melts at 660.3°C.
Magnesium melts at 639°C , sodium at 98°C and potassium at 64°C.
The melting point is the temperature at which a substance begins to melt. As a solid substance is heated, or absorbs heat from the environment, the molecules that make up that substance begin to gain more (heat) energy, enough to overcome the intermolecular forces that in the first place have been holding them together in a sort of rigid fashion.
This energy enables the molecules to break free of their intermolecular forces and thus the solid's lattice structure changes and the solid becomes liquid.
C) 22 because the mass of a neutron is 1 amu and a proton is also 1 amu, so 40-18=22
