Jane and mark make an h-r diagram and conclude that the sun is the brightest and hottest star within 20 light years of earth. do you agree with their claim? why or why not?

No

Explanation:

Sirius A is the brightest, hot star nearest to Earth next to the Sun. It is about 8.6 light years away. It has 98% mass of the Sun confined in size smaller than our Earth. It has a surface temperature of 9940 K which is much greater than the surface temperature of the Sun (5800 K).

Thus, Jane and Mark's claim is incorrect that the Sun is the brightest and the hottest star within 20 light years of the Earth. The Sun is the brightest because of its proximity but not the hottest.

58750.08068 is the answer i think

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.