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<u>Answer:</u> The correct option is C) decomposition
<u>Explanation:</u>
Single displacement reaction is defined as the reaction where a more reactive element displaces a less reactive element from its salt solution.
Element B is more reactive than element A
Double displacement reaction is defined as the reaction where an exchange of ions takes place in a solution
Decomposition reaction is defined as the reaction where a single large chemical species breaks down into two or more smaller chemical species.
Synthesis reaction is defined as the reaction where two or more smaller chemical species combine together in their elemental state to form a single large chemical species.
For the given chemical reaction:
Here, water is breaking down into two smaller species of oxygen and hydrogen gas. Thus, it is a decomposition reaction.
Hence, the correct option is C) decomposition
Taking into account the definition of molarity, the concentration of Na₃PO₄ in solution is 0.192.
Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
Molarity is expressed in units .
Being the molar mass of Na₃PO₄ 163.94 g/mole, that is, the amount of mass that a substance contains in one mole, the amount of moles that contains 23.6 g sample of Na₃PO₄ is calculated as:
Then you know:
- number of moles= 0.144 moles
- volume= 750 mL= 0.750 L (being 1000 mL= 1 L)
Replacing in the definition of molarity:
Solving:
Molarity= 0.192
Finally, the concentration of Na₃PO₄ in solution is 0.192.
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