Answer: the molar mass is 74.092 g/mol
Explanation:
V is more reactive, hope this helps!
Answer:
-431.5 J/g
Explanation:
Mass of solution = Mass of solute + mass of solvent
Solute is KOH while solvent is water.
Mass of KOH = 16.9 g
Mass of water = 90.8 g
Mass of solution = 16.9 + 90.8
= 107.7 g
Change in temperature (Δt) = 34.27 - 18.5
= 16.2 °C
Heat required to raise the temperature of water is released by dissolving KOH.
Therefore,
Heat released by KOH = m × s× Δt
= 107.7 × 4.18 × 16.2
= 7293 J
Heat released by per g KOH = 7293 J/16.9 g
= 431.5 J/g
As heat is released therefore, enthalpy change would be negative.
Enthalpy change of KOH = -431.5 J/g
For a neutral solution,
[H+][OH-] = 1 x 10⁻¹⁴
Answer: the effective nuclear charge of sulfur is less than that of chlorine
Explanation:
Ionization Energy can be defined as the energy needed for the complete removal of valence electron.
Ionization Energy decreases steadily down the group because of the outer electrons becomes progressively separated from the nucleus, hence they are less tightly held.
Also, Ionization Energy increases from left to right across the period i.e formation of a cation becomes more difficult owing to increase in nuclear charge.
Therefore, the effective nuclear charge of sulfur is less than that of chlorine because Chlorine have a greater ionization energy.
