moles NaCl = grams/molar mass.
moles H2O = grams/molar mass
total moles = nH2O + nNaCl
XNaCl = n NaCl/total moles.
If exactly 100.0 grams of NaCl (molecular mass = 58.44 g/mol) are dissolved in 300 grams of water (molecular mass = 18.02 g/mol), the mole fraction of NaCl is
a) 1.71
b) 0.0932
c) 0.250
d) 0.103
e) 4.75
1 answer