The solubility of a gas is 0.14 g/L at STP. Its solubility at 50.°C and the same pressure can be:

0.12 g/L

Explanation:

We first calculate its molar mass M = solubility at STP × molar volume = 0.14 g/L × 22.4 L/mol = 3.14 g/mol

Using the ideal gas law, PV = mRT/M where P = pressure at STP = pressure at 50°C = 1 atm, V = volume of gas, m = mass of gas, R = molar gas constant = 0.082 atm L/mol-K, T = temperature of gas = 50°C = 273 + 50 = 323 K and M =molar mass of gas = 3.14 g/mol

So, PM/RT = m/V = solubility of gas at 50°C

So, PM/RT = 1 atm × 3.14 g/mol/(0.082 atm L/mol-K × 323 K)

= 3.14 atm g/mol ÷ 26.486 atm L/mol

= 0.119 g/L

≅ 0.12 g/L

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."