Which of the following is the charge of iron in the compound, Fe(SO4)2?

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Which of the following is the charge of iron in the compound, Fe(SO4)2?
How does the C-N bond in CN-1 differ from the C-H bond in CH4?
The cyanide ion has which of the following molecular geometries?
Photo attributed to melburnian.
A 1 mol sample of ammonia gas (NH3) at 1 atm and 273 K is compressed to 2 atm. What is the difference in volume before and after compression?
Photo attributed to Rudolf_Schuba.
If 45.1 grams of a solute is added to 302 grams of water to make a 0.65M solution, what is the molar mass of a solute?
Which of the radioactive decay particles have the lowest penetrating power?
Mixture A is formed using KCl and H2O and mixture B is formed using MgCl2 and H2O. If the two mixtures have the same molality, which of the following statements would be true about the boiling point of the mixtures?
Which of the following will not dissolve in water?
Which of the following compounds would have the highest boiling point?
According to the ideal gas law at STP, which of the following is the value of the ratio between moles (assume 1 mole), the gas constant R, temperature and the pressure?