When ignited, solid ammonium dichromate decomposes in a fiery display. This is the reaction for a "volcano" demonstration. The decomposition produces nitrogen gas, water vapor, and chromium(III) oxide. The temperature is constant at 25°C.

Substance H0f (kJ/mol) S0 (kJ/mol . K)

a. Cr2O3 (g) -1140 0.0812

b. H2O (I) -242 0.1187

c. N2 (g) 0 0.1915

d. (NH4)2 Cr2O7 - 22.5 0.1137

Your question is half unfinished, regarding the chromium III oxide the correct option that expresses the inorganic formula of said compound is "A"

Explanation:

In the reaction an initial salt reacts giving as product water vapor, nitrogen gas and an oxide that is chromium oxide.

Chromium oxide is an oxide that adopts the structure of corundum, compact hexagonal. It consists of an anion oxide matrix with 2/3 of the octahedral holes occupied by chromium. Like corundum, Cr2O3 is a tough, brittle material.

It is used as a pigment, green in color.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

2b2t

explanation:

2b2t