Answer:
ΔH vaporization of chloroform is 30.1kJ/mol
Explanation:
It is possible to find ΔH of vaporization of certain compound knowing vapor pressure under 2 different absolute temperatures (In Kelvin) by using Clausius-Clapeyron equation:
<em>Where P is vapor pressure. R is gas constant (8.314J/molK) and T absolute temperature of 1, first state and 2, final state.</em>
Absolute temperatures in the problem are:
T₁ = 24.1°C + 273.15 = 297.25K
T₂ = -6.3°C + 273.15 = 266.85K
Replacing:
30073J/mol = 30.1kJ/mol = ΔHVap
<h3>ΔH vaporization of chloroform is 30.1kJ/mol</h3>
Answer:Homogeneous catalysts:NO(g), KI(aq.)
Heterogeneous catalyst:H₂(g) bonded to a metal surface,Pd(s) Coating
Explanation:
Homogeneous catalysis is a catalysis reaction in which the reactants as well the catalyst catalyzing the reaction are in the same phase that is, the catalyst and reactants have same phase.
In the examples NO(g) which acts as a catalyst for the oxidation of SO₂(g) to SO₃(g) is in the same gaseous phase as the reactant SO₂(g). So this is an example of homogeneous catalysis.
In the example KI(aq.) which acts as a catalyst for the decomposition of H₂O₂(aq.) is in the same aqueous phase as reactant H₂O₂(aq.). So this is an example of homogeneous catalysis.
Hence NO(g) and KI(aq.) are homogeneous catalysts.
Heterogeneous catalysis is a catalysis reaction in which the reactants and catalyst are in different phase . That is the catalyst and reactant do not have same phase.
In the examples H₂(g) bonded to a metal surface is an example of heterogeneous catalysis as the phase of H₂(g) and metal surface(s) are different hence this is an example of heterogeneous catalysis.
The Pd(s) acting as a catalyst for the conversion of noxious gas to less harmful gas is also an example of heterogeneous catalyst as the phase of Pd(s) and gases are different. Pd(s) is solid and the gases are gaseous in nature.
The Correct choices are :
- 1. The elements have filled valence levels.
- 2. potassium (K) with a 1+ charge
Explanation:
If a gas were to be heated up the pressure does not change, but the volume it will.
For a fixed mass or gas at constant pressure is volume ÷ temperature stays the same.
The answer is Strontium(Sr). The reactive increase from right to left. And this element has two valence electrons. So Rb is not correct. Then the very reactive metal is Sr.