One method for separating polypeptides utilizes their different solubilities. the solubility of large polypeptides in water depends upon the relative polarity of their r groups, particularly the number of ionized groups. the more ionized groups there are, the more soluble the polypeptide. which polypeptide, (gly)20 or (lys−ala)3 , is more soluble at ph 7.0 ? (gly)20 (lys−ala)3 which polypeptide, (glu)20 or (phe−met)3 , is more soluble at ph 7.0 ? (phe−met)3 (glu)20 which polypeptide, (ala−asp−gly)5 or (asn−ser−his)5 , is more soluble at ph 3.0 ? (asn−ser−his)5 (ala−asp−gly)5 which polypeptide, (ala−ser−gly)5 or (asn−ser−his)5 , is more soluble at ph 6.0 ? (ala−ser−gly)5 (asn−ser−his)5

Hope you find the answer

The answer is d i think

    pb(so₄)₂this element is lead (iv) sulfate. lead is a multivalent ion. but we know that sulfate ions, so₄²⁻, have a charge of -2. in order to have the ratios match up, we need pb⁴⁺ (two times as many pb⁴⁺  than so₄²⁻).the molar mass can be calculated by finding the mass of one mole of this compound. consider the following calculation,  where amu represents the atomic mass unit. the amu for each atom involved in this compound can be found on a periodic table.  molar mass = amu pb + 2(amu s + 4 * amu o)from a periodic table (with masses rounded to the nearest tenth),      amu pb = 207.2 g    amu s =  32.1 g    amu o = 16.0 gtherefore    molar mass =  207.2 + 2(32.1 + 4*16.0) = 399.4 gthe molar mass is therefore 399.4 grams per mol

0.4 j/gcplug in known variables to specific heat equation