Resistance is the slowing of the flow of electrons and where some of the electrical energy is converted into heat. true or fals
1 answer:
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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
Answer:
a. Approximately .
b. Approximately .
Explanation:
The unit of concentration "" is equivalent to "
", which means "moles per liter."
However, the volume of both solutions were given in mililiters . Convert these volumes to liters:
.
.
In a solution of volume where the concentration of a solute is
, there would be
(moles of) formula units of this solute.
Calculate the number of moles of formula units in each of the two solutions:
Solution in a.:
.
Solution in b.:
.
What volume of that (same as
)
solution would contain that many
For the solution in a.:
.
Convert the unit of that volume to milliliters:
.
Similarly, for the solution in b.:
.
Convert the unit of that volume to milliliters:
.