# CHEM

Consider the reaction, 3 NO2(g) + H2O(l) ® 2 HNO3(aq) + NO(g),
where DH = – 137 kJ. How many kilojoules are released when 92.3 g of NO2 reacts?

1. 👍
2. 👎
3. 👁
1. kJ released = 137 kJ x (92.3/(3*molar mass NO2) = ?

1. 👍
2. 👎
2. Oh Lord, the first reply like...that was not the question, seriously?
NO2 mass: 46.01
DH -137 kJ
92.3g NO2 x 3 moles NO2 / 46.01 g NO2 = 6.018 moles
-
6.018 moles NO2 x 137 kJ / 3 moles NO2 = 2.75 x 10^2 kJ

1. 👍
2. 👎
3. made a mistake lol divided by 3 moles when it should have been 1 in the first equation
NO2 mass: 46.01
DH -137 kJ
92.3g NO2 x 1 moles NO2 / 46.01 g NO2 = 2.000609 moles
-
2.000609 moles NO2 x 137 kJ / 3 moles NO2 = 91.6 kJ

1. 👍
2. 👎

## Similar Questions

1. ### chemistry

what volume (in ML) of a 0.150 M HNO3 solution is required to completely react wtih 35.7 mL of a 0.108 M Na2CO3 solution according to the following balanced chemical equation? Na2CO3(aq) + 2 HNO3(aq) --> 2NaNO3(aq) + H2O(l) then,

2. ### chemistry

Which of the following equations correctly describes the relationship between the rate at which NO2 and Cl2 are consumed in the following reaction? 2 NO2(g) + Cl2(g) → 2 NO2Cl(g) A. -d(NO2)/dt = 1/2 [d(Cl2)/dt] B. -d(NO2)/dt = 2

3. ### Chemistry

The following reaction mechanism has been proposed for a reaction: (slow) NO2 + NO2-> NO3 + NO (fast) NO3 + CO -> CO2 + NO2 A. Write the equation for the overall reaction from the mechanism above. B.Write the rate law for the

4. ### Chemistry

C + HNO3 = CO2 + NO2 + H2O oxidation, reduction and balancing

1. ### Chemistry

Write the ionic equation for these reaction. Ca(HCO3)2 + HCL = CaCl2 + CO2 + H2O ZnO + HNO3 = Zn(NO3)2 + H2O

2. ### chemistry

Calculate ∆H0 for the reaction 2 N2(g) + 5 O2(g) −→ 2 N2O5(g) given the data H2(g) + 1 2 O2(g) −→ H2O(ℓ) ∆H0 f = −290 kJ/mol N2O5(g) + H2O(ℓ) −→ 2 HNO3(ℓ) ∆H0 = −77.8 kJ/mol 1 2 N2(g) + 3 2 O2(g) + 1 2

3. ### science

For the reaction: 2 N2O5 (g) → 4 NO2 (g) + O2 (g) The experimental data for this reaction is : t = 0.0 s [N2O5] = 0.80 M [NO2] = 0.0 M [O2] = 0.0 M t = 20.0 s [N2O5] = 0.60 M [NO2] = 0.40 M [O2] = 0.10 M What is the average rate

4. ### Chemistry

Hey, can you help me balance this equation? Cu2S + HNO3 --> Cu(NO3)2 + CuSO4 + NO2 +H2O Thanks!

1. ### Chem

Nitric acid is produced commercially by the Ostwald process, represented by the following equations: 4NH3(g) + 5O2(g) > 4NO(g) + 6H2O(g) 2NO(g) + O2(g) > 2NO2 (g) 3NO2(g) + H2O(l) > 2HNO3(aq) + NO(g) What mass of NH3 must be used

2. ### Chemisty

Given the data in the table below, ∆Horxn for the reaction 3NO2(g) + H2O(l) → 2HNO3(aq) + 3NO(g) is __________ kJ. Substance ∆Horxn (kJ/mol) H2O(l)= -286 NO(g)= 90.0 NO2(g)= 34.0 HNO3(aq)= -207 NH3(g)= -46.0 A) -140 B) -508

3. ### chemistry

A mixture of hydrogen peroxide, H2O2, and hydrazine, N2H4, can be used as a rocket propellant. The reaction is: 7 H2O2(g) + N2H4(l) ® 2 HNO3(aq) + 8 H2O(l) a) How many moles of H2O2 react with 0.477 mol N2H4? [1] ___________ b)

4. ### chemistry

Balance the following redox reaction occurring in acidic solution Cu(s) + NO3-(aq)--> Cu2+(aq) +NO2(g) This is what I have done so far Cu-->Cu2+ + 2e- 2H + NO-3 --> NO2 + H2O Need help please