Answer:
they destroy or break stuff i think lol hope this helps
Explanation:
Answer:
diffrent types of maks and modles
Explanation:
The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.
You'd need
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
