Dimethylglyoxime, DMG, is an organic compound used to test for aqueous nickel(II) ions. A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C. What is the molar mass of DMG? Kb = 1.22°C/m, boiling point of pure ethanol = 78.5°C

117.5 g/mol.

Explanation:

ΔTb = Kb · bB

where,

ΔTb = the boiling point elevation = Tb (solution) - Tb (pure solvent).

Kb = the ebullioscopic constant

bB = the molality of the solution

ΔTb = 80.3 - 78.5

= 1.8 °C

1.8 = 1.22 x bB

= 1.475 mol/kg

Molality is the number of moles of the solute divided by the mass of the solvent.

Number of moles solute = 1.475 * 0.375

= 0.55 mol

Molar mass = mass/number of moles

= 65.0/0.55

= 117.5 g/mol.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.