Formation Reaction Problems: No Idea how to solve it

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Formation reactions for substances at 1 atmosphere pressure and 25°C involve writing balanced chemical equations that represent the formation of a compound from its elements in their standard states. For Mercury (I) chloride solid, the reaction can be expressed as the combination of mercury and chlorine gas to form the solid compound. For Nitroethane (CH3CH2NO2) liquid, the formation reaction includes the elements carbon, hydrogen, nitrogen, and oxygen in their standard states combining to form the liquid compound. There is some confusion regarding the temperature, as 25°C is not standard temperature and pressure (STP), which is typically defined as 0°C and 1 atmosphere. It is suggested to confirm the conditions with a teacher for clarity.
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Write formation reactions at 1 atmosphere pressure and 25°C for each of the following substnaces:
Mercury (I) chloride solid
Nitroethane (CH3CH2NO2) liquid

I have absolutely no idea how to do this. If anyone can help show or explain to me how to solve this, I'd appreciate it
 
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Are you sure it is 25 degrees C because the 1 atmosphere (101.325 kpa) is STP but the 25 degrees C is not at STP, but SATP.

If you know how to write normal formation reactions, write it that way. However, do not take my word for law. I'd suggest to ask you teacher if no one else on this forum answers this question.
 
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