7. nh2co2nh4(s) when heated to 450 k undergoes the following reaction to produce a system which reaches equilibrium: nh2co2nh4(s) ⇀↽ 2 nh3(g) + co2(g) the total pressure in the closed container under these condition is found to be 0.843 atm. calculate a value for the equilibrium constant, kp. a) 0.00701 b) 0.0888 c) 0.222 d) 0.599

Value of equilibrium constant is 0.0888

Explanation:

Both and are gaseous. Hence equilibrium constant depends upon partial pressures of and .

Initially no and were present.

Hence mole fraction of and at equilibrium can be calculated from coefficient of and in balanced equation.

Mole fraction of = (number of moles of )/(total number of moles of and ) =

Mole fraction of = (number of moles of )/(total number of moles of and ) =

Let's assume both and behaves ideally.

Therefore partial pressure of , and P_{CO_{2}}= x_{CO_{2}}.P_{total}

Where x represents mole fraction

So,

So,

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.