Question

In the book (and movie) The Martian. Mark Watney reduces hydrazine (N_2H_4) with an iridium catalyst in order to produce hydrogen gas a) Write the balanced chemical equation for the standard enthalpy of/or mat ion fox hydrazine. b) If the standard heat of formation of hydrazine is 50.63 kJ/mol, how much heat is released when 1.0000 kg of hydrazine is reduced to hydrogen gas and nitrogen gas? What volume of hydrogen gas is produced at STP?

Answer 1

a) N2_(g)   + 2 H2_(g) ---------------> N2H4_(g)

b) first convert mass to moles

n = W/MW

n = 1000 g/ 32 g /mol

n = 31.25

now according to given data

1 mole gives 50.63 KJ energy

31.25 moles gives 31.25 x 50.63 = 1582.19 KJ energy

answer = 1582.19 kJ