Achemist is studying an unknown substance. he can break it into its elemental components only by using chemical means how should the unknown substance be classified

Explanation:

An element is defined as a substance that contains same type of atoms.  An element can never be broken down into its constituent particles.

For example, a spoon made up of only copper metal will contain only atoms of copper.

A compound is defined as a substance in which atoms chemically combine together in a fixed ratio by mass.

For example, is a compound.

A compound can be broken down into its constituent particles by chemical means.

therefore, we can conclude that given unknown substance be classified as compound.

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.