Sulfuric acid can dissolve aluminum metal according to the reaction: 2Al ( s ) + 3 H 2 SO 4 ( a q ) → Al 2 ( SO 4 ) + 3 H 2 ( g ) Suppose you wanted to dissolve an aluminum block with a mass of 22.5 g. What minimum amount of H 2 SO 4 in grams do you need? How many grams of H 2 gas will be produced by the complete of the aluminum block?
Sulfuric acid can dissolve aluminum metal according to the reaction: 2Al ( s ) + 3 H 2 SO 4 ( a q ) → Al 2 ( SO 4 ) + 3 H 2 ( g ) Suppose you wanted to dissolve an aluminum block with a mass of 22.5 g. What minimum amount of H 2 SO 4 in grams do you need? How many grams of H 2 gas will be produced by the complete of the aluminum block?
Sulfuric acid can dissolve aluminum metal according to the reaction:
2Al
(
s
)
+
3
H
2
SO
4
(
a
q
)
→
Al
2
(
SO
4
)
+
3
H
2
(
g
)
Suppose you wanted to dissolve an aluminum block with a mass of 22.5 g. What minimum amount of
H
2
SO
4
in grams do you need? How many grams of
H
2
gas will be produced by the complete of the aluminum block?
4.
a) Give a suitable rationale for the following cyclization, stating the type of process involved
(e.g. 9-endo-dig), clearly showing the mechanistic details at each step.
H
CO₂Me
1) NaOMe
2) H3O®
CO₂Me
2. Platinum and other group 10 metals often act as solid phase hydrogenation catalysts for
unsaturated hydrocarbons such as propylene, CH3CHCH2. In order for the reaction to be
catalyzed the propylene molecules must first adsorb onto the surface. In order to completely
cover the surface of a piece of platinum that has an area of 1.50 cm² with propylene, a total
of 3.45 x 10¹7 molecules are needed. Determine the mass of the propylene molecules that
have been absorbed onto the platinum surface.
Chem 141, Dr. Haefner
2. (a) Many main group oxides form acidic solutions when added to water. For example solid
tetraphosphorous decaoxide reacts with water to produce phosphoric acid. Write a balanced
chemical equation for this reaction.
(b) Calcium phosphate reacts with silicon dioxide and carbon graphite at elevated temperatures
to produce white phosphorous (P4) as a gas along with calcium silicate (Silcate ion is SiO3²-)
and carbon monoxide. Write a balanced chemical equation for this reaction.
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