Question 11

A high-energy propulsion system uses HMDA, an organic nitrogen compound, as a fuel.

HMDA has a composition by mass of $62.1%62.1\%$ carbon, $24.1%24.1\%$ nitrogen, and $13.8%13.8\%$ hydrogen.

Calculate the empirical formula of HMDA.

The relative molecular mass ( $M_r$ ) of HMDA is $116.0$ . Determine the molecular formula of HMDA.

HMDA ( $C6H16N2\text{C}_6\text{H}_{16}\text{N}_2$ ) reacts with liquid dinitrogen tetroxide ( $N2O4\text{N}_2\text{O}_4$ ) in a combustion chamber.

Balance the chemical equation for this reaction:

\text{C}_6\text{H}_{16}\text{N}_2 + \underline{\quad}\text{N}_2\text{O}_4 \rightarrow \underline{\quad}\text{N}_2 + \underline{\quad}\text{CO}_2 + \underline{\quad}\text{H}_2\text{O}

The enthalpy change ( $ΔH\Delta H$ ) for this reaction is $kJ/mol-3850\text{ kJ/mol}$ . Explain how this value shows that the reaction is exothermic.

A high-energy propulsion system uses HMDA, an organic nitrogen compound, as a fuel.

HMDA has a composition by mass of $62.1%62.1\%$ carbon, $24.1%24.1\%$ nitrogen, and $13.8%13.8\%$ hydrogen.

Calculate the empirical formula of HMDA.

The relative molecular mass ( $M_r$ ) of HMDA is $116.0$ . Determine the molecular formula of HMDA.

HMDA ( $C6H16N2\text{C}_6\text{H}_{16}\text{N}_2$ ) reacts with liquid dinitrogen tetroxide ( $N2O4\text{N}_2\text{O}_4$ ) in a combustion chamber.

Balance the chemical equation for this reaction:

\text{C}_6\text{H}_{16}\text{N}_2 + \underline{\quad}\text{N}_2\text{O}_4 \rightarrow \underline{\quad}\text{N}_2 + \underline{\quad}\text{CO}_2 + \underline{\quad}\text{H}_2\text{O}

The enthalpy change ( $ΔH\Delta H$ ) for this reaction is $kJ/mol-3850\text{ kJ/mol}$ . Explain how this value shows that the reaction is exothermic.

Chemical formulae, equations and calculations