The given reactions involve the formation of CaO and CaCO3. Looking at the coefficients, in the first equation, 2 moles of CaO are formed from 2 moles of Ca. In the second equation, 1 mole of CaO is formed from 1 mole of Ca. Therefore, we can infer that the formation of 1 mole of CaO releases half the energy (AHran) compared to the formation of 1 mole of CaO in the first equation.
Now, in the first equation, the formation of 2 moles of CaO releases energy represented by "2x". In the second equation, the formation of 1 mole of CaO releases energy represented by "x/2".
Therefore, the expression for AHran in the reaction CaCO3(s) → CaO(s) + CO2(g) would be
AHran = x/2 + y
The correct answer is C) x + 2y.
2 Ca(s) + O2(g) → 2 CaO(s) x
Ca(s) + CO2(g) + O2(g) → CaCO3(s) y
Based on the information in the table above, which of the following expressions is equivalent to AHran for the reaction represented below?
CaCO3(8)→ CaO (s) + CO2(g)
A) 8 12 +y
B )y
C )x+2y
D )x- 2y
1 answer