The unknown acid H 2 X can be neutralized completely by OH − according to the following (unbalanced) equation: H 2 X ( a q ) + O H − ( a q ) → X 2 − ( a q ) + H 2 O ( l ) The ion formed as a product, X 2− , was shown to have 36 total electrons. What is element X? Propose a name for H 2 X. To completely neutralize a sample of H 2 X, 35.6 mL of 0.175 M OH − solution was required. What was the mass of the H 2 X sample used?
The unknown acid H 2 X can be neutralized completely by OH − according to the following (unbalanced) equation: H 2 X ( a q ) + O H − ( a q ) → X 2 − ( a q ) + H 2 O ( l ) The ion formed as a product, X 2− , was shown to have 36 total electrons. What is element X? Propose a name for H 2 X. To completely neutralize a sample of H 2 X, 35.6 mL of 0.175 M OH − solution was required. What was the mass of the H 2 X sample used?
Solution Summary: The author explains that the name of the element X has to be identified from the given info.
The unknown acid H2X can be neutralized completely by OH− according to the following (unbalanced) equation:
H
2
X
(
a
q
)
+
O
H
−
(
a
q
)
→
X
2
−
(
a
q
)
+
H
2
O
(
l
)
The ion formed as a product, X2−, was shown to have 36 total electrons. What is element X? Propose a name for H2X. To completely neutralize a sample of H2X, 35.6 mL of 0.175 M OH− solution was required. What was the mass of the H2X sample used?
Using reaction free energy to predict equilibrium composition
Consider the following equilibrium:
2NH3 (g) = N2 (g) +3H₂
—N2 (g) AGº = 34. kJ
Now suppose a reaction vessel is filled with 4.19 atm of ammonia (NH3) and 9.94 atm of nitrogen (N2) at 378. °C. Answer the following questions about this
system:
rise
Under these conditions, will the pressure of NH 3 tend to rise or fall?
☐ x10
fall
Х
Is it possible to reverse this tendency by adding H₂?
In other words, if you said the pressure of NH 3 will tend to rise, can that
be changed to a tendency to fall by adding H₂? Similarly, if you said the
pressure of NH3 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
00.
18
Ar
무ㅎ
?
Identifying the major species in weak acid or weak base equilibria
The preparations of two aqueous solutions are described in the table below. For each solution, write the chemical formulas of the major species present at
equilibrium. You can leave out water itself.
Write the chemical formulas of the species that will act as acids in the 'acids' row, the formulas of the species that will act as bases in the 'bases' row, and the
formulas of the species that will act as neither acids nor bases in the 'other' row.
You will find it useful to keep in mind that HF is a weak acid.
2.2 mol of NaOH is added to
1.0 L of a 1.4M HF
solution.
acids:
П
bases:
Х
other: ☐
ப
acids:
0.51 mol of KOH is added to
1.0 L of a solution that is
bases:
1.3M in both HF and NaF.
other: ☐
00.
18
Ar
Using reaction free energy to predict equilibrium composition
Consider the following equilibrium:
N2O4 (g) 2NO2 (g)
AG⁰ = 5.4 kJ
Now suppose a reaction vessel is filled with 1.68 atm of dinitrogen tetroxide (N204) at 148. °C. Answer the following questions about this system:
rise
Under these conditions, will the pressure of N2O4 tend to rise or fall?
x10
fall
Is it possible to reverse this tendency by adding NO2?
In other words, if you said the pressure of N2O4 will tend to rise, can that
be changed to a tendency to fall by adding NO2? Similarly, if you said the
pressure of N2O4 will tend to fall, can that be changed to a tendency to
rise by adding NO2?
If you said the tendency can be reversed in the second question, calculate
the minimum pressure of NO 2 needed to reverse it.
Round your answer to 2 significant digits.
yes
no
0.42 atm
☑
5
0/5
?
مله
Ar
Chapter 4 Solutions
OWLv2 with MindTap Reader, 4 terms (24 months) Printed Access Card for Zumdahl/Zumdahl's Chemistry, 9th
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