the initial mass of the sample was .851 g, after heating the sample weighed .627 g. how much water was in the sample in grams and percent?

Ineed with a, b, c, d, and e on the long answer

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive