How many grams does a 0.640 mol sample of boric acid, H3BO3 weigh?

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

What are transitions between a liquid and gas called? identify which way they are transitioning

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: