Astudent weighs out 8.21 g of (nh4)2s, transfers it to a 500. ml volumetric flask, adds enough water to dissolve the solid and then adds water to the 500 ml mark on the neck of the flask. calculate the concentration (in molarity units) of ammonium sulfide in the resulting solution?

0.24 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

where,

n= moles of solute

= volume of solution  in ml = 500  ml

Putting in the values:-

Thus the molarity of is 0.24 M.

b is the correct

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.