Answer:
Missing component
Cl₂
H₂O
Explanation:
Reaction given:
? + 2NaBr → 2NaCl+Br
Mg+? → MgO+H2
missing component = ?
Solution:
Reaction 1
? + 2NaBr -----→ 2NaCl + Br
if we look at the reactants and products there is one element is in product side but not shown in the reactant side.
In products there are following atoms
Na (Sodium)
Cl (Chlorine)
Br (Bromine)
In Reactant there are following atoms
Na (Sodium)
Br (Bromine)
So only Chlorine is missing in the reactant side.
if we put chlorine in the reactant then this reaction will be complete
Cl + 2 NaBr -----→ 2NaCl + Br
So chlorine react with water and give sodium chloride and bromine molecule, this is a single displacement reaction and chlorine replace bromine in the above reaction
Now balance the equation
Cl₂ + 2 NaBr -----→ 2NaCl + Br₂
So, the missing component is
____________
Reaction 2
Mg + ? ---------→ MgO + H₂
if we look at the reactants and products there are two element in product side but not shown in the reactant side.
In products there are following atoms
Mg (Magnesium)
O (Oxygen)
H (Hydrogen)
In Reactant there is only one following atom
Mg (Magnesium)
So Oxygen and Hydrogen is missing in the reactant side.
if we put water molecule (H₂O) in the reactant then this reaction will be complete
Mg + H₂O ---------→ MgO + H₂
in this reaction magnesium (Mg) react with water (H₂O) and give magnesium oxide and hydrogen gas.
So, the missing component is
= 0.763 mole