The oxides of Group 2A metals (symbolized by M here) react with carbon dioxide according to the following reaction: MO ( s ) + CO 2 ( g ) → MCO 3 ( s ) A 2.85-g sample containing only MgO and CuO is placed in a 3.00-L container. The container is filled with CO 2 to a pressure of 740. torr at 20.°C. After the reaction has gone to completion, the pressure inside the flask is 390. torr at 20.°C. What is the mass percent of MgO in the mixture? Assume that only the MgO reacts with CO 2 .
The oxides of Group 2A metals (symbolized by M here) react with carbon dioxide according to the following reaction: MO ( s ) + CO 2 ( g ) → MCO 3 ( s ) A 2.85-g sample containing only MgO and CuO is placed in a 3.00-L container. The container is filled with CO 2 to a pressure of 740. torr at 20.°C. After the reaction has gone to completion, the pressure inside the flask is 390. torr at 20.°C. What is the mass percent of MgO in the mixture? Assume that only the MgO reacts with CO 2 .
Solution Summary: The author explains the mass percentage of MgO in the given reaction.
The oxides of Group 2A metals (symbolized by M here) react with carbon dioxide according to the following reaction:
MO
(
s
)
+
CO
2
(
g
)
→
MCO
3
(
s
)
A 2.85-g sample containing only MgO and CuO is placed in a 3.00-L container. The container is filled with CO2 to a pressure of 740. torr at 20.°C. After the reaction has gone to completion, the pressure inside the flask is 390. torr at 20.°C. What is the mass percent of MgO in the mixture? Assume that only the MgO reacts with CO2.
2.
Add the following group of numbers using the correct number of significant figures for the
answer. Show work to earn full credit such as rounding off the answer to the correct number
of significant figures. Replace the question marks with the calculated answers or write
the calculated answers near the question marks.
10916.345
37.40832
5.4043
3.94
+
0.0426
?
(7 significant figures)
The emf at 25°C of the cell: Pt l H2(g) l dis X:KCl (sat) l Hg2Cl2(s) l Hg l Pt was 612 mV. When solution X was replaced by normal phosphate buffer solution with a pH of 6.86, the emf was 741 mV. Calculate the pH of solution X.
Indicate how to calculate the potential E of the reaction Hg2Cl2(s) + 2e ⇄ 2Hg + 2Cl- as a function of the concentration of Cl- ions. Data: the solubility product of Hg2Cl2.
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