Consider the lattice energies of the following group 2a compounds: beh2, 3205 kj/mol; mgh2, 2791 kj/mol; cah2, 2410 kj/mol; srh2, 2250 kj/mol; bah2, 2121 kj/mol. part a what is the oxidation number of h in these compounds?

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

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2