Industrial production of nitric acid, which is used in many products including fertilizers and explosives, approaches 10 billion kg per year worldwide. the first step in its production is the exothermic oxidation of ammonia, represented by the following equation. 4 nh3(g) + 5 o2(g) → 4 no(g) + 6 h2o(g) δh⁰rxn = −902.0 kj if this reaction is carried out using 7.056 ✕ 103 g nh3 as the limiting reactant, what is the change in enthalpy?

Explanation:

The balanced chemical equation :

To calculate the moles, we use the equation:

According to stoichiometry:

4 moles of produces = 902.0 kJ of energy

415.1 moles of produces = of energy

Thus the change in enthalpy is

the answer is a

photosynthesis

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.