The formula for Epsom salts is MgSO4*7H2O. If 1.250g of the compound is dissolved in water, calculatenthe number of milliliters of 0.200M Ba(NO3)2 that would be required to just precipitate all of the sulfate as barium sulfate.

25 mL

Explanation:

From the balanced equation of reaction:

1 mole of the epsom salt requires 1 mole of to precipitate barium sulfate.

mole of epsom salt = mass/molar mass

                              =  1.250/246.4746 = 0.0051 mole

Hence, 0.0051 mole of epsom salt will also require 0.0051 mole of for sulafe's precipitation.

Molarity of = mole/volume = 0.200 M

Volume = mole/molarity

                 = 0.0051/0.200

                      = 0.025 Liter

0.025 Liter = 25 milliliters.

25 milliliters of 0.200 M would be required to precipitate all the sulfate as barium sulfate.

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).