Question

calculate the molarity of 10gm of glucose in 90 gm of H2o​

Answer 1

In order to know your answer firstly know about molality

Molality may be defined as the number of moles of solute that are dissloved in a kg of water .

so firstly we have to calculate the moles of glucose

10*1/180.16 = 0.0555 ( as the molar mass of glucose= 180.1559)

These are dissloved in 90 g of water.

first convert mass into kilogram =90/1000= 0.090 kg

0.090 kg water = 0.0555 moles of glucose

so 1 kg of water=1*0.0555/0.090 = 0.6166 moles of glucose

round about of 0.6166 will be 0.617 which is our answer