Homework Answers
7.
mass of Na2So4=14.7 gm
mass of water=345 gm
total mass=345+14.7
=359.7 gm
mass % of Na2So4=(mass of Na2So4/total mass) x 100
=(14.7/359.7) x100
=4.08 %
8.
a.
moles of maethanol=mass of mathanol/molar mass of methanol
=7.5/32
=0.234 moles
moles of water=245/18
=13.62
mole fraction of methanol=moles of methanol/moles of methanol+moles of water
=0.234/13.62+.234
=0.0168
b.
moles of methanol=55.7/32
=1.74 moles
moles of water=164/18
=9.12
mole fraction of methanol=moles of methanol/moles of methanol+moles of water
1.74/1.74+9.12
=0.1602
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