Question

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?
A) 156
B) 0.50 ×156
C) 0.250 × 0.50 ×156
D) 0.250
0.50
×156
E) 0.50
0.250
×156

Answer 1

Molarity =0.5M

Vol soln=250ml=0.25L

Molar mass=155.6

Molarity

= moles of solute/vol of soln (L)

=Weight/mol mass×vol of soln

As ,moles=weight/molar mass

Weight

=Molarity×vol(soln)×mol mass

=0 .5×0.25×155.6

I hope this helps ( ╹▽╹ )