1. what is the molarity of 6.4g of methanol dissolved in 50 moles of water2. if the density of the above solution at 25c is 1.03kg/l what is the molarity methanol solution at 25°c

1. 0.22 mol/dm³

2. 0.23 mol/dm³

Explanation:

Molarity: This can be defined as the concentration of a substance  in mol per dm³

1.

M = n/v Equation 1

M = molarity of methanol, n = number of mole of methanol, v = volume of the solvent/water/solution.

n = g/m.m

Where g = mass of methanol, m.m = molar mass of methanol.

g = 6.4 g, m.m = 32 g /mole.

n = 6.4/32 = 0.2 mole

and ,

v = m/d

Where m = mass of water, d = density of water

m = mass of 50 moles of water = 18×50 = 900 g.

d = 1000 g/dm³.

v = 900/1000 = 0.9 dm³

Substituting the value of v and n into equation 1

M = 0.2/0.9

M = 0.22 mol/dm³

2.

M = n/v

v = volume of the solution

v = (mass of methanol + mass of water in the solution)/density of the solution

v = [(900+6.4)/1000]/1.03

v = 0.9064/1.03

v = 0.88 dm³

n = 0.2 mole

Therefore,

M = 0.2/0.88

M = 0.23 mol/dm³

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i