A 0. 025-g sample of a compound composed of boron and hydrogen, with a molecular mass of ~28 amu, burns spontaneously when exposed to air, producing 0. 063 g of b2o3. What are the empirical and molecular formulas of the compound?.

The measure of the angles supplement is 30 more than four times that of its complement. find the measure of the angle described

In her article "why should i vote? " stephanie goggin crafts a well-organized and coherent argument. she states that every person of voting age who is registered should vote. she also argues that if you are not registered to vote, you should be. in conclusion, goggin's argument is laid out in a thoughtful and thorough way that is convincing to readers. which element is missing from this evaluation?

How are students who take the writing portion of accuplacer graded?