Answer:
Mass of Fe produced = 44.7 g
Explanation:
Given data:
Mass of Fe produced in gram = ?
Mass of FeO react = 57 g
Solution:
Chemical equation:
2Al + 3FeO → 3Fe + Al₂O₃
Number of moles of FeO:
Number of moles = mass/ molar mass
Number of moles = 57 g/ 71.844 g/mol
Number of moles = 0.8 mol
Now we will compare the moles of Fe with FeO from balance chemical equation.
FeO : Fe
3 : 3
0.8 : 0.8
Mass of Fe:
Mass = Mass × molar mass
Mass = 0.8 mol × 55.845 g/mol
Mass = 44.7 g
The less soluble salt : PbCl₂
<h3>Further explanation</h3>
Given
0.1 M NaCl
Required
The less soluble salt
Solution
If we see from the answer option, the salt that is more difficult to dissolve in NaCl is PbCl₂ because it has the same ion (Cl)
When PbCl₂ is dissolved in water, ionization will occur
PbCl₂ ⇒ Pb²⁺+ 2Cl⁻
So, when dissolved in NaCl, NaCl itself will be ionized
NaCl ⇒ Na⁺ + Cl⁻
Based on the principle of equilibrium, the addition of an ion (one of the ions is enlarged), the reaction will shift towards the ion that was not added. In addition to this Cl ion, the reaction will shift to the left so that the solubility of PbCl₂ will decrease (the reaction to the right decreases)
Concentration of Solutions is oftenly expressed in Molarity. Molarity is the number of moles of solute dissolved per volume of solution.
Molarity = Moles / Volume
As,
Moles = Mass / M.mass
So,
Molarity = Mass / M.mass × Volume ---- (1)
Data Given;
Volume = 0.750 L
Mass = 52 g
M.mass = 180 g/mol
Putting Values in eq.1,
Molarity = 52 g ÷ (180 g.mol⁻¹ × 0.750 L)
Molarity = 0.385 mol.L⁻¹
