phrase \"like dissolves like\" refers to the fact that _____. polar solvents dis
ID: 475994 • Letter: P
Question
phrase "like dissolves like" refers to the fact that _____. polar solvents dissolve nonpolar solutes and vice versa gases can only dissolve other gases polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes solvents can only dissolve solutes of similar molar mass condensed phases can only dissolve other condensed phases Which of the following substances is more likely to dissolve in CH_3OH? H_2 CCl_4 K_r N_2 CH_3CH_2OH Molality is defined as the _______. moles solute/kg solvent moles solute/moles solvent moles solute/liters solution moles solute/kg solution none (dimensionless) Calculate the molality of a 10.0% (by mass) aqueous solution of hydrochloric acid. 0.274 2.74 3.05 4.33 The density of the solution is needed to solve the problem. Which one of the following compounds is soluble in water? Ca_3(PO_4)_2 CaS SrSO_4 Fe_2S_3 PbCl_2Explanation / Answer
Like dissolves like refers to the fact that polar solvents dissolve polar solute and non-polar solvents dissolve
non-polar solutes. So option C is the answer.
30) Methanol (CH3OH) is a polar compound. So, a polar solutes are likely soluble.
H2 , N2, Kr are non-polar whereas CCl4 and CH3CH2OH are polar. However if we have to choose one
correct answer then it would be CH3CH2OH because it highly polar than CCl4 . Option E
31) Molality = moles of solute / Kg of solvent , Option A is the correct answer
32) Assume a basis of 100 grams of solution (solvent+solute)
10% of 100 grams will be 10 gms which is equal to the mass of the solute(HCl)
moles of solute or HCl = weight of HCl in gms / Molar mass of HCl = 10 gms / 36.46094 g/mol
moles of HCl = 0.2743 mol
mass of solvent = 100 gm - 10gm = 90gm = 0.09 Kg
molality = mol of solute / Kg of solvent = 0.2743mol / 0.09 kg = 3.0474 m
33) CaS is soluble in water, Option B is the answer. Also Ca3(PO4) is very insignificantly soluble
in water. Here is a reaction of CaS with water
CaS (s) + 2H2O (l) ----------> H2S (aq) + Ca(OH)2 (aq)
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