If 76 grams of nal are dissolved in enough water to make 225.0 ml of solution, what is the molarity of the solution? (2.25 mol/l)

2.25 M

Explanation:

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity  

V = volume of solution in liter ,

n = moles of solute ,

Moles is denoted by given mass divided by the molecular mass ,  

Hence ,  

n = w / m

n = moles ,  

w = given mass ,  

m = molecular mass .

From the question ,

w = given mass of Nal  = 76 g

and ,  

V =volume of solution =  225.0 mL

since ,

1 mL = 1 / 1000 L

V  = 225.0 / 1000 L = 0.225 L

Since ,  

we know ,

m = Molecular mass of NaI = 149.89 g / mol

using , the above formula to calculate the moles ,  

n = w / m = 76 g /  149.89 g/mol = 0.507 mol

now , calculating the molarity as ,

M = n / V = 0.507 mol  / 0.225 L = 2.25 M

the answer would be b i believe

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.