Hydrazine can be used as a rocket fuel. A 6.4 g sample of hydrazine is found to contain 5.6 g of nitrogen and 0.80 g of hydrogen. The molar mass of hydrazine is
the same as that of oxygen gas. Determine the empirical formula and the
molecular formula of this compound. (show work; use labels)

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how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.