B. Precipitates are formed when two solutions combine to form another solution and a solid.
5 Na molecules and 5 Cl molecules
567000 would be in grams, hope this helps :)
The mass of oxygen and hydrogen must be equal to the mass of the substance they create the water. So if the hydrogen is 2.8 g the oxygen must account for the rest of the mass. Basically just subtract 25.4-2.8=mass of oxygen
