What is the density of a gas at STP that has a molar mass of 50.0 g/mol?

At stp, 1 mol of any gas occupies 22.4 L.

and 1 mol of this gas u gave has a mass of 28.4 g  

m=dv becomes d=m/v = 28.4/22.4= 1.2678571428571428571428571428571 m/L

2)  molar volume at STP: 22.4 L and 1mol of this gas has a mass of 53.3 g

then d=m/v= 53.3/ 22.4 = 2.3794642857142857142857142857143 m/L

2.232 g/L

Explanation:

Assuming 1 mol, volume at STP is 22.4 L so you simply divide 50g by 22.4 L to get density

"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."

i think the answer is terrae but not 100 percent sure. ▓▬▬ §