Which statement best describes a solution?

1.a mixture consisting of minute particles suspended in a medium that start moving about as soon as the mixing process stops

2.a mixture consisting of larger particles suspended in a medium that start settling down as soon as the mixing process stops

3.a mixture having a uniform composition where the components can't be seen separately and all components are in the same state

4.a mixture having a uniform composition but the components can be seen separately and all components are in a different state

Option (3) is the correct answer.

Explanation:

A solution is defined as a homogeneous mixture in which solute particles are evenly distributed into the solvent.

A solution is a clear solution whose particles cannot be separated out as they are all present in same state.

On the other hand, a mixture in which particles are unevenly distributed into the solvent is known as a heterogeneous mixture.

For example, sand in water is a heterogeneous mixture.

Particles of a heterogeneous mixture can be separated out generally through filtration. This is because these particles are not present in same state.

Thus, we can conclude that the statement a mixture having a uniform composition where the components can't be seen separately and all components are in the same state, best describes a solution.

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"