Which calculation below represents the mass of
copper(II) nitrite (MM = 155.6 g/mol) should be
weighed out to produce 250 ml of a 0.50 M solution?

Answer : The mass of in the solution is, 19.4 grams.

Explanation : Given,

Molarity of solution = 0.50 M

Volume of solution = 250 mL

Molar mass of = 155.6 g/mole

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :

Now put all the given values in this formula, we get:

Therefore, the mass of in the solution is, 19.4 grams.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.