- Please help me with 2 3 and 4?

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Prove that (g o f)^(-1) is equal to f (-1) o g (-1)? How do I calculate the chemical formula of iron (ii) sulfide? Water molecules are polar with what? If 2.29 g of CuNO3 is dissolved in water to make a 0.780 M solution, what is the volume of the solution? What is the structure of: C10H10O2: NMR: δ 2.82 (6H, s), δ 8.13 (4H, s) IR: 1681 cm–1, no O–H stretch?