While not used as frequently, mole fraction is another unit of concentration. Mole fraction is the fraction of moles of one substance over the total moles in the sample. mole fraction (chi) equals moles of A over total moles What is the mole fraction of O2 in a sample with 3.50 grams of O2 and 25.6 g N2

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next