Ah is gold and Rh is rhodium and Os is osmium and Ir iridium
STP stands for standard temperature and pressure. Standard pressure is equivalent to 1 atm, and standard temperature is equivalent to 273.15 K. Therefore, your answer is A. the temperature is 273.15 kelvin.
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Is a compound that went through a chemicAl change
The two most abundant elements in Earths core are Iron and Nickel.
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The answer would be B because you can go and find evidence and facts to conduct an investigation on that.