Answer:
1 mole
Explanation:
m(Fe) = 112 g
n(Fe₂O₃) = ?
First you must calculate how many moles of Fe is in 112 g of Fe:
n(Fe) = m(Fe) / Ar(Fe) = 112 g / 55,85 g moles⁻¹ = 2 moles
Now, from reaction you compare moles of Fe and Fe₂O₃ :
2 n(Fe₂O₃) = n(Fe)
n(Fe₂O₃) = n(Fe) / 2 = 1 mole
You should have given us a table, but I think my table shouldn't be too different.
Let's put oxidation numbers first.
You would have to know that Mg(s) is a reducing agent and Br2(l) is an oxidizing agent. But it is pretty common knowledge that the halogens will tend to take the electrons and alkali and alkaline earth metals will tend to give up electrons.
Mg is oxidized because it gives up electrons; Br2(l) is reduced because it gains electrons. Since the reaction conforms to what we would expect to <em>naturally</em> (thermodynamically favored) occur, it can take place given that the activation energy is supplied.
Answer:
0.012× 10⁻²³ moles of iron
Explanation:
Given data:
Number of moles of iron = ?
Number of iron atoms = 0.0723 atom
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
0.0723 atom × 1 mol / 6.022 × 10²³ atoms
0.012× 10⁻²³ mol
Answer:
Copper
Explanation:
Within intermolecular forces, ion-dipole is the strongest, followed by hydrogen bonding, then dipole-dipole, and then London dispersion.
Answer:
1015.92 cmH₂O
Explanation:
The pressure of a fluid (liquid or gas) can be measured by the force that it does in a column of a standard liquid. When the liquid is the mercury, the pressure is measured in units of Hg, and when the column is filled with water, the value is obtained in units of H₂O.
The value depends on the density and the specific weight of the liquid. To convert mmHg to cmH₂O:
1 mmHg ----------- 1.36 cmH₂O
747 mmHg ------ x
By a simple direct three rule:
x = 1015.92 cmH₂O
