Problem: Which of the following substances have a standard heat of formation (ΔHf°) of zero?a) Cl2(g) at 2 atmb) C2H6 at standard conditionsc) O2(g) at 25.0 °Cd) 1 atm Fe at 1200 °C

FREE Expert Solution
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FREE Expert Solution
  • Recall that substances with standard heat of formation of zero are the ones in their natural state at 1 atm. 

  • Analyzing the choices:

92% (394 ratings)
Problem Details

Which of the following substances have a standard heat of formation (ΔHf°) of zero?

a) Cl2(g) at 2 atm

b) C2H6 at standard conditions

c) O2(g) at 25.0 °C

d) 1 atm Fe at 1200 °C

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Based on our data, we think this problem is relevant for Professor Cruickshank's class at NAU.