Answer:
The coefficients are: 1, 2, 1, 2
Explanation:
To know which option is correct, we shall balance the equation. This can be obtained as follow:
SnO₂ + H₂ —> Sn + H₂O
There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by writing 2 before H₂O as shown below:
SnO₂ + H₂ —> Sn + 2H₂O
There are 2 atoms of H on the left side and a total of 4 atoms on the right side. It can be balance by writing 2 before H₂ as shown below:
SnO₂ + 2H₂ —> Sn + 2H₂O
Now the equation is balanced.
The coefficients are: 1, 2, 1, 2
Thus, none of the options are correct.
Answer:
It is A) Calcium
Explanation:
Calcium has an electronic configuration of 2,8,8,2
The chemical reaction that occurs between , and to form cryolite (molecular formula: ) is:
The balanced reaction is:
In order to determine the weight of cryolite produced, the limiting reactant (the reactant that is completely used up in the reaction) should be identified first. To determine the limiting reactant, the number of moles of each reactant with respect to cryolite () should be calculated.
The formula for determining the number of moles is:
1. For :
According to the balanced equation, 1 mole of reacts to give 2 moles of .
Molar mass of
So,
Number of moles =
2. For :
According to the balanced equation, 6 mole of reacts to give 2 moles of .
Molar mass of
So,
The number of moles =
3. For :
According to the balanced equation, 12 moles of reacts to give 2 moles of .
Molar mass of
So,
Number of moles = .
Thus, is the limiting reactant.
Molar mass of
Amount of produced = =
Since,
Hence, the amount of cryolite produced is .
Answer:
Freezing and Melting (Fusion)
Explanation:
I believe that would be the net ionic equation between the weak acid and strong base.