Question

1
1.6 g of NaOH is dissolved in 54 g of water. What is the mass percent of solution
obtained?
2. Molar concentration of glucose solution is 0,01 mol/L. What mass of glucose is
needed for preparation of 300 ml of solution?
3. Calculate mass percent of calcium carbonate in solution if molar concentration
of the equivalent is 0.05 mol​

Answer 1

1M

The molar mass of NaOH is 40 g/mol.

The number of moles of NaOH is equal to the ratio of its mass to molar mass.

The number of moles of NaOH =

40g/mol

40g

=1mol

The molarity of NaOH solution is the ratio of number of moles of NaOH to total volume of solution in L.

M=

1L

1mol

=1M

Answer 2

Answer:

1)

Given: 1.6g NaOH and 54g water

To find: mass percent

mass percent = ( given mass / total mass) x 100

total mass = 1.6 + 54 = 55.6g

mass percent = (1.6 / 55.6) x 100

= 2.87%