Answer:
The balanced chemical reaction is given as:

Step-by-step explanation:
When liquid hydrazine and dinitrogen tetroxide gas reacts together they give nitrogen gas and water vapors as a product.
The balanced chemical reaction is given as:

According to reaction, 2 moles of hydrazine reacts with 1 mole of dinitrogen tetroxide to give 3 moles of dinitrogen gas and 4 moles of water vapors.