How many moles of HCl are needed to react with 0.87 mol Al?

When light strikes a plane mirror, images form in locations where light does not actually reach. it only appears to the observer as though the light were coming from this position. what type of image is formed?

Consider the story you just read. all but one of the choices below indicate that something is living.

What is the average rate of the reaction between 10 and 20 s?