If a hydrate of Na2SO3 is heated to 250 °C, all the water of hydration is lost. On heating a 1.687 g sample of the hydrate, 0.843 g of Na2SO3 remains. How many molecules of water occur per formula unit of Na2SO3?

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?