In order to determine the purity of ammonium sulfate, a sample with a mass of 0.850 g is dissolved in KOH. The equation for the reaction that takes place is NH 4 + ( a q ) + OH − ( a q ) → NH 3 ( a q ) + H 2 O The ammonia liberated is distilled into a flask that contains 50.00 mL of 0.250 M HCI. Not all the HCI is consumed. The excess HCI reacts with 17.3 mL of 0.120 M NaOH. What is the mass percent of (NH 4 ) 2 SO 4 in the sample?
In order to determine the purity of ammonium sulfate, a sample with a mass of 0.850 g is dissolved in KOH. The equation for the reaction that takes place is NH 4 + ( a q ) + OH − ( a q ) → NH 3 ( a q ) + H 2 O The ammonia liberated is distilled into a flask that contains 50.00 mL of 0.250 M HCI. Not all the HCI is consumed. The excess HCI reacts with 17.3 mL of 0.120 M NaOH. What is the mass percent of (NH 4 ) 2 SO 4 in the sample?
Solution Summary: The author explains that the mass percent of (NH_Text4) is equal to the ratio of given mass to molar mass. The formula for finding the volume of either solution is given by
In order to determine the purity of ammonium sulfate, a sample with a mass of 0.850 g is dissolved in KOH. The equation for the reaction that takes place is
NH
4
+
(
a
q
)
+
OH
−
(
a
q
)
→
NH
3
(
a
q
)
+
H
2
O
The ammonia liberated is distilled into a flask that contains 50.00 mL of 0.250 M HCI. Not all the HCI is consumed. The excess HCI reacts with 17.3 mL of 0.120 M NaOH. What is the mass percent of (NH4)2SO4 in the sample?
It is not unexpected that the methoxyl substituent on a cyclohexane ring
prefers to adopt the equatorial conformation.
OMe
H
A G₂ = +0.6 kcal/mol
OMe
What is unexpected is that the closely related 2-methoxytetrahydropyran
prefers the axial conformation:
H
H
OMe
OMe
A Gp=-0.6 kcal/mol
Methoxy: CH3O group
Please be specific and clearly write the reason why this is observed. This effect that provides
stabilization of the axial OCH 3 group in this molecule is called the anomeric effect. [Recall in the way of
example, the staggered conformer of ethane is more stable than eclipsed owing to bonding MO
interacting with anti-bonding MO...]
206 Pb
82
Express your answers as integers. Enter your answers separated by a comma.
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VAΣ
ΜΕ ΑΣΦ
Np, N₁ = 82,126
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Previous Answers
?
protons, neutrons
Please draw the inverted chair forms of the products for the two equilibrium reactions
shown below. Circle the equilibrium reaction that would have a AG = 0, i.e., the relative energy of
the reactant (to the left of the equilibrium arrows) equals the relative energy of the product? [No
requirement to show or do calculations.]
CH3
CH3
HH
CH3
1
-CH3
Chapter 4 Solutions
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