Using the equations SrO (s) + CO₂ (g) → SrCO₃ (s) ∆H° = -234 kJ/mol

2 Sr(s) + O₂ (g) → 2 SrO (s) ∆H° = -1184 kJ/mol

CO₂ (g) → C(s) + O₂ (g) ∆H° = 394 kJ/mol

Determine the enthalpy (in kJ/mol) for the reaction

2 SrCO₃ (s) → 2 Sr (s) + 2 C(s) + 3 O₂ (g).

I also need it in exact sig figs.

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.

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).