- #1

CroSinus

- 32

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**1. Homework Statement**

The chemical reaction is given:

2C2H2 + 5O2 -> 4CO2 + 2 H2O. ΔrH* = -1299 kJ / mol.

How much heat is released when 50 grams of C2H2 is burned?

2C2H2 + 5O2 -> 4CO2 + 2 H2O. ΔrH* = -1299 kJ / mol.

How much heat is released when 50 grams of C2H2 is burned?

## Homework Equations

## The Attempt at a Solution

First, I convert mass into moles.

M(C2H2) = 2*12+2 = 26 g/mol

n(C2H2) = m/M = 50 g / 26 gmol

n(C2H2) = 1,923 mol

Now I say: if 1299 kJ of heat is released when 2 moles of C2H2 are burned, then for 1.923 moles of the same thing I get 1249.05 kJ of heat (energy). Am I right?

Please be so king to comment on my answer! Let me know if I am right or wrong? Thank you very much.

CroSinus

M(C2H2) = 2*12+2 = 26 g/mol

n(C2H2) = m/M = 50 g / 26 gmol

^{-1}n(C2H2) = 1,923 mol

Now I say: if 1299 kJ of heat is released when 2 moles of C2H2 are burned, then for 1.923 moles of the same thing I get 1249.05 kJ of heat (energy). Am I right?

Please be so king to comment on my answer! Let me know if I am right or wrong? Thank you very much.

CroSinus