How much heat is produced when 1.25 g of chromium metal reacts with oxygen gas under standard conditions?

Explanation:

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In this case, the undergoing chemical reaction is:

In such a way, we compute the corresponding yielded moles of chromium (III) oxide by stoichiometry:

Now, since this is about a formation reaction, the standard enthalpy of formation accounts for the released heat during this reaction, which is:

Finally, as we computed the yielded moles, we compute the associated produced heat via:

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the correct answer would be b) volume versus temperature, because they are also directly proportional.