It is 5 significant figures since the first 3 0s don't count
ΔH=MCΔT
ΔH=100 x 4.2 x 4
ΔH=1680
ΔH per mole = ΔH ÷ moles
ΔH per mole = 1680 ÷ 0.02
<span>ΔH per mole= 84000Jmol
</span>84000 ÷ 1000 = 84KJmol
its exothermic as heat is given out into the solution
Since HClO4 is a strong acid it will completely dissociate in solution.
HClO4 + H2O --> H3O+ + ClO4-
Therefore, your concentration of HClO4 will be equal to your amount of H3O+, the conjugate acid in solution.
The Ka expression is as follows:
Ka= [H3O+][ClO4-] / [HClO4]
So you know that -log [H3O+] gets you pH, so just plug in [2.2] as your concentration of H3O+ and your answer should be -.34 pH
From its atomic number of 15, it is possible to predict that the phosphorus atom has <span>15 protons and 15 electrons.
</span>Atomic number of an chemical element shows number og protons in that element. Because chemical elements are neutral charges, number of positive particles (protons) and negative particles (electrons) are the same.
A roman numeral is used in ionic compounds when the cation is a transition metal.
