Chem.

posted by .

Nitrogen oxide (NO) has been found to be a key component in the many biological processes. It also can react with oxygen to give the brown gas NO2. When one mole of NO reacts with oxygen, 57.0 kJ of heat is evolved.
a) Write the thermochemical equation for the reaction between one mole of nitrogen oxide and oxygen.
Is a thermochemical equation just like any other equation? I have written:
2NO + O2 --> 2NO2
b)Is the reaction exothermic or endothermic?
I know what endothermic and exothermic reactions are, but how do I determine this from the information given?
d) What is delta-H when 5.00 g of NO reacts?

What I had is this:
5.00 g x 1 mol/30.01 g = .1666 mol
1/.1666= 6.00
delta-H= q
q= 57.0 kj/mol / 6.00 = 9.50 kJ

I'm not sure if this makes sense or not.
e) How many grams of nitrogen oxide must react with an excess of oxygen to liberate ten kilojoules of heat?
This sounds a bit like a limiting-excess reaction to me, but I'm not sure if I need to use that to complete the problem. So far I have written
10.00 kJ = m * Cp * delta-T
However this leaves me with two unknowns, so that's not a big help.

a) Yes and no. A thermo equation is just like any other equation EXCEPT that they are written for 1 mol of the material. Besides, the problem states to use 1 mol NO.
NO + 1/2 O2 ==> NO2
Thermochemists aren't bothered by the 1/2 O2.

b)The problem states that 57.0 kJ of energy is EVOLVED (hint: given off?). So that makes it an __________ reaction.

c)You are correct with the number but is the sign correct? If heat is given off then delta H should be negative?

d. 30.01 g NO will react to give 57.0 kJ of heat. So how many g NO are required to give 10 kJ of heat?
30.01 g NO x 10 kJ/57.0 kJ = ??

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. General Chemistry

    Nitric oxide (NO) reacts with oxygen gas to form nitrogen dioxide (NO2), a dark-brown gas: 2NO(g) + O2(g) -> 2NO2(g) In one experiment 0.886 moles of NO is mixed with 0.503 moles of O2. Calculate which of the two reactants is the …
  2. Genera Chemistry

    Nitric oxide (NO) reacts with oxygen gas to form nitrogen dioxide (NO2), a dark-brown gas: 2NO(g) + O2(g) -> 2NO2(g) In one experiment 0.886 moles of NO is mixed with 0.503 moles of O2. Calculate which of the two reactants is the …
  3. stoichiometry

    Ammonia gas reacts with oxygen gas according to the following equation: 4NH3 + 5O2----4NO + 6H2O a. How many moles of oxygen gas are needed to react with 23 moles of ammonia?
  4. chemistry

    given the following data at a certain temperature, calculate K for the reaction between one mole of dinitrogen oxide gas and oxygen gas to give dinitrogen tetraoxide 2N2 + O2 TO GIVE 2N2 K=1.2X10-35 N2O4 TO GIVE 2NO2 K=4.6X10-3 1/2N2 …
  5. AP Chemistry

    Given: 2N2(g) +O(2) --> 2N2O(g) Kc =1.2x10^(-35) N2O4(g) --> 2NO2(g) Kc = 4.6x10^(-3) 1/2N2(g) + O2(g) --> NO2(g) Kc= 4.1x10^(-9) Calculate Kc for the reaction between one mole of dinitrogen oxide gas and oxygen gas to give …
  6. General Chem

    Nitrogen oxide reacts with oxygen gas to form nitrogen dioxide (NO2). In one experiment 0.866 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced
  7. chemistry

    Condition Pressure Volume Temperature Comment initial 1.0 atm 22.4 L 273 K 1 mole of N2 gas fills the tank. final 3.0 atm 22.4 L 273 K 2 moles of O2 gas have been added to the 1 mole of N2 gas in the tank. Key Questions 7. What was …
  8. chemistry

    In the formation of smog, nitrogen and oxygen gas react to form nitrogen dioxide: N2(g)+2O2(g)→2NO2(g)How many grams of NO2 will be produced when 2.1L of nitrogen at 840mmHg and 28∘C are completely reacted?
  9. chemistry

    Nitrogen and oxygen react to form nitric oxide (NO). All substances are in the gas phase. If 0.352 atm of nitrogen and 0.511 atm of oxygen react, what is the partial pressure of nitric oxide (in mmHg) when this reaction goes 73.9 complete. …
  10. chemistry

    ┬áIf we combine nitrous oxide (NO, laughing gas) with oxygen (O2) we produce nitrogen dioxide (NO2) according to the following reaction: 2NO + O2→ 2NO2 How many grams of NO2 will be produced when 5.00 moles of NO react?

More Similar Questions