Give the nuclear symbol for the isotope of potassium for which a=40?
2 answers:
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Answer:
A) The partial presssure of CO₂ is 167 mm Hg
B) The partial presssure of N₂ is 354 mm Hg
C) The partial presssure of Ar is 235 mm Hg
D) The partial presssure of H₂ is 86 mm Hg
Explanation:
Dalton's law of partial pressures is basically expressed by the following statement:
The total pressure of a mixture is equal to the sum of the partial pressures of its components.
So initially we have:
= total presure of the system (675 mm Hg).
= partial pressure of N₂ (354 mm Hg).
= partial pressure of Ar (235 mm Hg).
Using Dalton's law we can find the partial pressure of H₂:
675 mm Hg=354 mm Hg + 235 mm Hg +
= 675 mm Hg - 354 mm Hg - 235 mm Hg
=86 mm Hg
If CO₂ gas is added to the mixture, at constant temperature, and the volume is the same, the difference between the new total pressure and the previous total pressure is equal to the partial pressure of CO₂.
842 mm Hg= 354 mm Hg + 235 mm Hg + 86 mm Hg +
= 842 mm Hg - 354 mm Hg - 235 mm Hg - 86 mm Hg
= 167 mm Hg
Answer:
= 25.05°C
Explanation:
Given:
the value of ΔHcomb (heat of combustion) for dimethylphthalate (C10H10O4) is = 4685 kJ/mol.
mass = 0.905g of dimethylphthalate
molar mass = 194.18g dimethylphthalate
number of moles of dimethylphthalate = ???
= 21.5°C
= 6.15 kJ/°C
= ???
since we have our molar mass and mass of dimethylphthalate ;we can determine the number of moles as;
0.905g of dimethylphthalate ×
number of moles of dimethylphthalate = 0.000466 moles
Heat released = moles of dimethylphthalate × heat of combustion
= 0.000466 moles × 4685 kJ
= 21.84 kJ
∴ Heat absorbed by the calorimeter =
21.84 kJ =6.15 kJ/°C
21.84 KJ =
21.84 KJ = - 132.225 kJ
21.84 KJ + 132.225 kJ =
154.065 kJ =
=
=25.05°C