How much heat in kilojoules is evolved or absorbed in the reaction of 1.00 g of Na with H 2 O ? Is the reaction exothermic or endothermic ? 2 N a ( s ) + 2 H 2 O ( l ) → 2 N a O H ( a q ) + H 2 ( g ) Δ H ° = − 368. 4 kJ
How much heat in kilojoules is evolved or absorbed in the reaction of 1.00 g of Na with H 2 O ? Is the reaction exothermic or endothermic ? 2 N a ( s ) + 2 H 2 O ( l ) → 2 N a O H ( a q ) + H 2 ( g ) Δ H ° = − 368. 4 kJ
Solution Summary: The author explains that the amount of heat evolved or absorbed in the reaction of sodium and water needs to be determined.
How much heat in kilojoules is evolved or absorbed in the reaction of 1.00 g of Na with
H
2
O
? Is the reaction exothermic or endothermic ?
2
N
a
(
s
)
+
2
H
2
O
(
l
)
→
2
N
a
O
H
(
a
q
)
+
H
2
(
g
)
Δ
H
°
=
−
368.
4 kJ
Given a system with an anodic overpotential, the variation of η as a function of current density- at low fields is linear.- at higher fields, it follows Tafel's law.Calculate the range of current densities for which the overpotential has the same value when calculated for both cases (the maximum relative difference will be 5%, compared to the behavior for higher fields).
Using reaction free energy to predict equilibrium composition
Consider the following equilibrium:
N2 (g) + 3H2 (g) = 2NH3 (g) AGº = -34. KJ
Now suppose a reaction vessel is filled with 8.06 atm of nitrogen (N2) and 2.58 atm of ammonia (NH3) at 106. °C. Answer the following questions about this
system:
rise
Under these conditions, will the pressure of N2 tend to rise or fall?
☐ x10
fall
Is it possible to reverse this tendency by adding H₂?
In other words, if you said the pressure of N2 will tend to rise, can that be
changed to a tendency to fall by adding H2? Similarly, if you said the
pressure of N will tend to fall, can that be changed to a tendency to rise
by adding H₂?
If you said the tendency can be reversed in the second question, calculate
the minimum pressure of H₂ needed to reverse it.
Round your answer to 2 significant digits.
yes
no
☐
atm
Х
ด
?
olo
18
Ar
Four liters of an aqueous solution containing 6.98 mg of acetic acid were prepared. At 25°C, the measured conductivity was 5.89x10-3 mS cm-1. Calculate the degree of dissociation of the acid and its ionization constant.Molecular weights: O (15.999), C (12.011), H (1.008).Limiting molar ionic conductivities (λ+0 and λ-0) of Ac-(aq) and H+(aq): 40.9 and 349.8 S cm-2 mol-1.
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Calorimetry Concept, Examples and Thermochemistry | How to Pass Chemistry; Author: Melissa Maribel;https://www.youtube.com/watch?v=nSh29lUGj00;License: Standard YouTube License, CC-BY