Question

34.2 g sugar was dissoled in water to produce 214.2g of sugar syrup caculate molarity & mole fraction of sugar in the syrup.​

Answer 1

Answer:

ANSWER

(i) Mass of sugar = 34.2 g

No. of moles of sugar =

Mol.mass

34.2

=

342

34.2

=0.1

Mass of water = (214.2-34.2)=180g=

1000

180

kg

No. of moles of water =

18

180

=10 mole

Molarity =

Mass of water in kg

No. of moles of sugar

=

180

0.1

×1000

=0.555M

Thus, the molarity of sugar is 0.555 M

(ii) Total number of moles =10.0+0.1=10.1

Mole fraction of sugar =

Total number of moles

No. of moles of sugar

=

10.1

0.1

=0.0099