Molality Example Problem - Worked Chemistry Problems

Molality Example Problem - Worked Chemistry Problems Molality is a methods for communicating the centralization of a substance arrangement. Heres a model issue to tell you the best way to decide it: Test Molality Problem A 4 g sugar solid shape (Sucrose: C12H22O11) is broken up in a 350 ml teacup of 80  °C water. What is the molality of the sugar solution?Given: Density of water at 80â ° 0.975 g/ml Arrangement Start with the meaning of molality. Molality is the quantity of moles of solute per kilogram of dissolvable. Stage 1 - Determine number of moles of sucrose in 4 g.Solute is 4 g of C12H22O11 C12H22O11 (12)(12) (1)(22) (16)(11)C12H22O11 144 22 176C12H22O11 342 g/moldivide this sum into the size of the sample4 g/(342 g/mol) 0.0117 mol Stage 2 - Determine mass of dissolvable in kg. thickness mass/volumemass thickness x volumemass 0.975 g/ml x 350 mlmass 341.25 gmass 0.341 kg Stage 3 - Determine molality of the sugar arrangement. molality molsolute/msolventmolality 0.0117 mol/0.341 kgmolality 0.034 mol/kg Answer: The molality of the sugar arrangement is 0.034 mol/kg. Note: For watery arrangements of covalent mixes, for example, sugar, the molality and molarity of a compound arrangement are practically identical. In this circumstance, the molarity of a 4 g sugar 3D shape in 350 ml of water would be 0.033 M.