In this reaction, how many grams of O2 are required to completely react with 110 grams of Al
Answers
33.6 g
of aluminium to react with that much manganese dioxide.
So, you've got your balanced chemical equation for this reaction
3
M
n
O
2
(
s
)
+
4
A
l
(
s
)
→
3
M
n
(
s
)
+
2
A
l
2
O
3
(
s
)
The mole ratio that exists between manganese dioxide and aluminium is simply the ration between the stoichiometric coefficients placed in front of them.
In your case, the balanced chemical equation shows that you have 3 moles of manganese dioxide reacting with 4 moles of aluminium; this means that your mole ratio will be
3:4
.
Likewise, the mole ratio between aluminium and manganese dioxide will be
4:3
→
4 moles of the former need 3 moles of the latter.
You can put this mole ratio to good use by determining how many moles of aluminium are needed to react with the number of moles of manganese dioxide present in 81.2 g. So,
81.2 g MnO
2
⋅
1 mole
86.94 g
=
0.9340 moles
M
n
O
2
This means that you'll need
0.934 moles
M
n
O
2
⋅
4 moles Al
3 moles
M
n
O
2
=
1.245 moles Al
To determine the number of grams needed to get that many moles use aluminium's molar mass
1.245 moles Al
⋅
26.98 g
1 mole Al
=
33.59 g Al
Rounded to three sig figs, the answer will be
m
aluminium
=
33.6 g
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In a strike-slip fault, the rocks on either side of the fault slip past each other sideways. The answer is True.
Answers
Answers
Answer : The number of moles of is,
moles.
Solution :
As we know that,
1 mole contains number of molecules
As, number of molecules of
are present in 1 mole of
So, number of molecules of
are present in
moles of
Therefore, the number of moles of is,
moles.
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AntoineLavoisier incorrectly characterize light as matter. The correct option is A.
Who was Antoine Lavoisier?
He is best known for discovering the role of oxygen in combustion. Antoine Lavoisier was a Frenchchemist who discovered that air is the source of combustion and acidity. He developed the metric system and debunked the phlogistontheory.
A diligent researcher, Antoine-Laurent Lavoisier, fundamentally changed chemistry. Among his many accomplishments, he established the law of conservation of mass, discovered that combustion and respiration are caused by chemical reactions with what he called "oxygen," and helped systematize chemicalnomenclature.
An element, according to Lavoisier, is a chemicalsubstance that cannot be decomposed using current analyticalmethods.
Mendeleev defined an element as a substance made up of atoms with the same atomic weight. Light is incorrectly described as matter by AntoineLavoisier.
Thus, the correct option is A.
For more details regarding AntoineLavoisier, visit:
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Light
Hope this helps