If 4.00 g of nacl react with 10.00 g of agno3, what is the excess reactant?

Answer : The excess reagent is,

Explanation :

First we have to calculate the moles of and .

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

From the balanced reaction we conclude that

As, 1 mole of react with 1 mole of

So, 0.068 moles of react with 0.068 moles of

From this we conclude that, the moles of are less than the NaCl. So, is a limiting reagent because it limits the formation of products and is an excess reagent.

Hence, the excess reagent is,

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.