1. mass of C=12g/mol, mass of H=1g/mol
==> mass of CH4=16g/mol, (16g/mol)*0.35mol= 5.6g
2. 0.25mol/1000ml*(12g/mol+16g/mol)*125ml= 0.875g
(I used .25 molar vice .25 molal, because you need to grams
of solvent to use Molality)
3. 6.02*10^23 molecules/mole * 0.75 Moles =...