Calculate Grams of C2H4 Needed to Produce 450 kJ of Heat

  • Thread starter Hydrolyziz
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In summary, to calculate the grams of C2H4 needed to produce 450 kJ of heat, you will need to use the formula Q = m*C*ΔT, where Q is the heat required, m is the mass of the substance (in this case C2H4), C is the specific heat capacity of the substance, and ΔT is the change in temperature. The specific heat capacity of C2H4 is 1.26 J/g°C and to convert kJ to J, you need to multiply the given value by 1000. It is important to use the specific heat capacity in the calculation as it takes into account the unique properties of a substance, ensuring a more accurate result. Other factors
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Hydrolyziz
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Homework Statement



How many grams of ethylene (C2H4) would have to be burned to produce 450 kJ of heat?

C2H4 + 3O2 ----> 2CO2 + H2O Delta H = -1411 kJ


The Attempt at a Solution



No clue
 
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GOT it ...8.9g
 
  • #3
.

I would approach this problem by first understanding the chemical reaction involved in the burning of ethylene (C2H4). From the given reaction, we can see that for every 1 mole of C2H4, 1411 kJ of heat is released. Therefore, to produce 450 kJ of heat, we would need 450/1411 moles of C2H4.

To convert moles to grams, we need to know the molar mass of C2H4, which is 28.05 g/mol. Multiplying the number of moles (450/1411) by the molar mass, we get the grams of C2H4 needed, which is approximately 14.3 grams.

Therefore, to produce 450 kJ of heat, we would need approximately 14.3 grams of C2H4. However, this is assuming complete combustion of C2H4, which may not always be the case in real-life scenarios.
 

1. How do you calculate the grams of C2H4 needed to produce 450 kJ of heat?

To calculate the grams of C2H4 needed to produce 450 kJ of heat, you will need to use the formula Q = m*C*ΔT, where Q is the heat required, m is the mass of the substance (in this case C2H4), C is the specific heat capacity of the substance, and ΔT is the change in temperature. Make sure to convert the given heat value into joules (kJ to J) and the specific heat capacity of C2H4 is 1.26 J/g°C.

2. What is the specific heat capacity of C2H4?

The specific heat capacity of C2H4 is 1.26 J/g°C. This means that it requires 1.26 joules of energy to raise the temperature of 1 gram of C2H4 by 1 degree Celsius.

3. How do you convert kJ to J?

To convert kJ (kilojoules) to J (joules), you need to multiply the given value by 1000. This is because 1 kJ is equal to 1000 J.

4. Why is it important to use the specific heat capacity in the calculation?

The specific heat capacity is important in the calculation because it takes into account the unique properties of a substance, such as its molecular structure and composition, which affects how much energy is required to raise its temperature. Using the specific heat capacity ensures a more accurate calculation.

5. Are there any other factors that may affect the accuracy of the calculation?

Yes, there are other factors that may affect the accuracy of the calculation. These include any heat losses to the surroundings, incomplete combustion of C2H4, and the use of an incorrect specific heat capacity value. It is important to consider and minimize these factors to ensure a more accurate calculation.

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