Answer:
180.87 °C
Explanation:
Applying pressure law,
P/T = P'/T'..................... Equation 1
Where P = Initial pressure of helium gas, T = Initial Temperature of helium gas, P' = Final Pressure of helium gas, T' = Final Temperature of helium gas
Make T' the subject of equation 1
T' = P'T/P......................... Equation 2
From the question,
Given: P = 1.5 atm, P' = 2.3 atm, T = 23°C = (23+273)K = 296 K
Substitute these values into equation 2
T' = (2.3×296/1.5)
T' = 680.8/1.5
T' = 453.87 K
T' = 453.87-273
T' = 180.87°C
Answer:
Li2S> Na2S> K2S> CsS
Explanation:
The lattice energy of ionic species depends on the relative sizes of ions in the ionic compounds. As the size of ions increases, the lattice energy decreases and vice versa.
When the size of the anions are the same, the lattice energy now depends on the relative sizes of the cations. Therefore, since all the compounds are sulphides and the order of magnitude of ionic sizes is: Li^+ < Na^+ < K^+ < Cs^+.
Therefore, the order of decrease in lattice energy is; Li2S> Na2S> K2S> CsS
Answer:
Lead
Explanation:
The subatomic particles within an atom can be used to know the atom or element given.
Of particular interest is the number of protons within the atom.
The periodic table is based on the atomic number of atoms. This atomic number is the number of protons within an atomic space.
So; If we know the number of protons within an atom, we can know the element.
The number of protons given is 82, the element is therefore lead.
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