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April 23, 2014

Homework Help: chemistry

Posted by rebecca niles on Tuesday, January 25, 2011 at 4:53am.

Hydrazine has the molecular formula N2H4 and is a volatile colourless liquid often used in industrial processes and as a rocket fuel. It has a single NN bond in its structural formula. When hydrazine is heated it produces ammonia (NH3) and nitrogen (N2) gases. When used to propel rockets, hydrazine reacts with dinitrogen tetroxide (N2O4) gas to give nitrogen gas and water vapour.

1.
Write a balanced chemical equation, including symbols, for each of the reactions of hydrazine described above, that is, when hydrazine is heated, and when it is used to propel rockets.

2.
Gaseous hydrazine reacts with a gas X to form the gases nitrogen and HX by way of the following reaction:
NH (g)+2X (g)=N (g)+4HX(g)

At a pressure of 1 atmosphere and a temperature of 25 C, 500 cm3 of the gas HX has a mass of 0.400 g. Calculate the value of the relative atomic mass of X and hence identify element X. (assume that 1 mole of gas occupies 24.5 dm3, and 1 dm3 = 1000 cm3. Assume the relative atomic mass of hydrogen to be 1.0.)

Sorry its a so long a question, help much appreciated, test due in two days,

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