_ Na3PO4 + _ HCl NaCl + _ H3PO4

Na₃PO₄ + 3HCl —> 3NaCl + H₃PO₄

The coefficients are: 1, 3, 3, 1

Explanation:

_Na₃PO₄ + __HCl —> __NaCl + _H₃PO₄

The above equation can be balance as follow:

Na₃PO₄ + HCl —> NaCl + H₃PO₄

There are 3 atoms of Na on the left side and 1 atom on the right side. It can be balance by writing 3 before NaCl as shown below:

Na₃PO₄ + HCl —> 3NaCl + H₃PO₄

There are 3 atoms of Cl on the right side and 1 atom on the left side. It can be balance by writing 3 before HCl as shown below:

Na₃PO₄ + 3HCl —> 3NaCl + H₃PO₄

Now, the equation is balanced.

The coefficients are: 1, 3, 3, 1

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.