Prepare 800 mL of 2M sodium chloride. How many grams of NaCl needs to be dissolve in a 800 mL distilled water?

93.6 g of NaCl.

Explanation:

We'll begin by converting 800 mL to litre (L). This can be obtained as follow:

1000 mL = 1 L

Therefore,

800 mL = 800 mL × 1 L / 1000 mL

800 mL = 0.8 L

Next, we shall determine the number of mole of NaCl in the solution. This can be obtained as follow:

Molarity = 2 M

Volume = 0.8 L

Mole of NaCl =?

Molarity = mole / Volume

2 = mole of NaCl / 0.8

Cross multiply

Mole of NaCl = 2 × 0.8

Mole of NaCl = 1.6 moles

Finally, we shall determine the mass of NaCl needed to prepare the solution. This can be obtained as follow:

Mole of NaCl = 1.6 moles

Molar mass of NaCl = 23 + 35.5

= 58.5 g/mol

Mass of NaCl =?

Mole = mass /Molar mass

1.6 = Mass of NaCl / 58.5

Cross multiply

Mass of NaCl = 1.6 × 58.5

Mass of NaCl = 93.6 g

Therefore, 93.6 g of NaCl is needed.

your answer is c) plasma

~*"auba14"*~

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.