Question #c27d4

1 Answer
Feb 11, 2018

Answer:

Molarity# =# (Number of moles of Solute)/(Volume of Solution in Litre)

Explanation:

Here Solute is #NaCl#(s) and solution is the #NaCl#(aq)

So, here we have to make #1 Litre# of #4M# #NaCl# solution.

#rArr# Molarity of #NaCl# solution #=# #4M#

and,

Volume of the #NaCl# solution #=# #1 L#

The Molar mass of #NaCl# = #58.44# g/mol

Using the formula of Molarity here we get :-

Molarity of #NaCl# solution #=# (Number of moles of #NaCl#)
/ (Volume of the #NaCl# solution in Litre)

#rArr# #4M# #=# (Number of moles of #NaCl#)/#1L#

#rArr# #4M#x#1L# #=# Number of moles of #NaCl#

#:.# Number of moles of #NaCl# #=# #4# moles

Amount of #NaCl# needed #=# #4# moles x # 58.44#g/mol

#rArr#Amount of #NaCl# needed#=233.76#g#=0.233#kg