Question

Automobile airbags inflate following a collision. The impact triggers the following chemical reaction (shock sensitive reaction), during which a large volume of gas is produced to fill the airbag.

2NaN3(s) --> 2Na(s) 3N2 (g)

d) Given the following enthalpies of formation, determine the standard enthalpy change for the reaction (deltaH) per mol of NaN3 reacted

Substance Delta H
NaN3(s) 21.7 kJ/mol
N2 (s) 0 kJ/mol
Na (g) 0 kJ/mol

What is the change in internal energy for the reaction when 1.0 mol of NaN3 is consumed?

Calculate w, q, and delta E if 2.0 mold of NaN3 were

Answer 1

I meant "delta U if 2.0 mol of NaN3 were consumed in a given experiment?

Answer 2

@thomaster please help

Answer 3

enthaply change = enthalpy of products - enthalpy of reactants

Answer 4

this should probs be in chemistry lel

Answer 5

okay, sorry about that. I forgot to switch the topic thingy.

Answer 6

okay did that and I got -43.4kJ/mol rxn

Answer 7

is that correct?

Answer 8

yep

Answer 9

now for:
What is the change in internal energy for the reaction when 1.0 mol of NaN3 is consumed?

We use our answer for the first bit.

we found that 2NaN3(s) --> 2Na(s) 3N2 (g) has \[\Delta H\]=043.4 kj/mol

Answer 10

-43.4*

so using molar ratio, 2moles of NaN3 gives us, -43.4 kj/mol.

hence 1 mol will give-21.7 kj/mol