21. A chemistry teacher needed 200 mL of 1.5 M Na S2O3, (molar mass 158 g/mole). How many grams should the teacher measure out?

Which statement justifies that phosphine (ph3) is a polar molecule?

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

Explain what happens at the saturation point when adding salt to water at room temperature.