Chemistry · 2020
JEE Main · 7 January 2020, Shift 2 · Q46
The standard heat of formation (Δ_f H_298^0) of ethane (in kJ / mol ), if the heat of combustion of ethane, hydrogen and graphite are -1560, -393.5…
The standard heat of formation $\displaystyle \left(\Delta_f \mathrm{H}_{298}^0\right)$ of ethane (in $\displaystyle \mathrm{kJ} / \mathrm{mol}$ ), if the heat of combustion of ethane, hydrogen and graphite are -$\displaystyle 1560$, -$\displaystyle 393.5$ and -$\displaystyle 286$ kJ/mol, respectively is \_\_\_\_.
Official answer
−192.5 or −85NTA’s answer key accepts either.
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JEE Main 2020 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.