Question

How many liters is needed to make a 7.65M solution when you have 1.4g of MgCl2?

Answer 1

Answer:

molarity=no.of moles/volume (in L)

finding no of moles.

no of moles=given mass/molar mass

no of moles= 1.4/(24+2(35.5))=1.4/94=0.0148≈0.015

no.of moles=0.015 mol

7.65 M=0.015/ volume in L

volume = 0.015/7.65 =0.00196 L

=1.96 ×10^-3 L