Question #c644d

1 Answer
Jun 10, 2016

Answer:

If #x=y#, then the expression #y=x# is also valid.
Proof.
#x=y#, taking #x# to RHS and #y# to LHS we obtain
#-y=-x#, Dividing both sides with #-1#, we obtain
#y=x#
#40mL#

Explanation:

Using the mole conservation equation
moles before dilution#=#moles after dilution
(we can also write moles after dilution#=#moles before dilution)
or # M_1V_1=M_2V_2#
#0.250 "mol"/"L"xxV_1=0.100"mol"/"L"xx100.0#
or #V_1=(0.100xx100)/0.250#
or #V_1=40mL#