Silver?
Fun FACT : An apple, potato, and onion all taste the same if you eat them with your nose plugged
Answer:
Oxygen = 15.999 g/mol
Iron = 3 × 55.845 = 167.535 g/mol
CaCO3 = 20 × 100.0869 = 2001.738 g/mol
We have that the molecular weight (3sf) of the compound (g/mol)

From the question we are told
A solution made by mixing 20.0 g of a non-volatile compound with 125 mL of water at 25°C has a vapor pressure of 22.67 torr. What is the molecular weight (3sf) of the compound (g/mol).
Generally the equation for the Rouault's law is mathematically given as
P=P_0 N

Therefore
The molecular weight (3sf) of the compound (g/mol)
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