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03.09.2019 •
Chemistry
How much heat is produced when 100ml of 0.25 m hcl (density 1.00g/ml) and 200 ml of 0.150 m naoh (densty 1.00g/ml) are mixed?
hcl + naoh ? nacl + h2o ho298= -58kj
if both solutions are the same temperatureand heat capaciy of the products is 4.19 j/gc, how much will the temperature increase? what assumption did you make in your calculation?
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Ответ:
Explanation:
The given data is as follows.
For HCl : Volume = 100 mL, Density = 1.00 g/ml, Molarity = 0.25 M
For NaOH : Volume = 200 mL, Density = 1.00 g/ml, Molarity = 0.150 M
Therefore, mass of HCl will be calculated as follows.
Density =
1.00 g/ml =
mass = 100 g
Also, number of moles =
Hence, no. of moles of HCl = (as 1 ml = 1000 L)
=
On the other hand, mass of NaOH will be calculated as follows.
Density =
1.00 g/ml =
mass = 200 g
Also, number of moles =
Hence, no. of moles of HCl = (as 1 ml = 1000 L)
=
Total mass = (100 g + 200 g) = 300 g
Since, HCl is the limiting reagent over here. So, heat produced by will be calculated as follows.
Q =
=
= kJ
= J
Also, it is known that relation between Q and temperature change is:
Q =
Hence, putting the values into the above formula as follows.
Q =
14.5 J =
=
Thus, we can conclude that increase in temperature is .
Ответ: