- I know Ga has 3 valence electrons, but home many does Ga2+ have?

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Aluminum has a density of 2.70 g/mL. Calculate the mass (in grams) of a piece of aluminum having a volume of 331 mL .? What mass of lead (density 11.4 g/cm3) would have an identical volume to 25.1 g of mercury (density 13.6 g/cm3)? How many moles of ammonium ions are in 6.945 g of ammonium carbonate? What mass of water must be weighed to obtain 7.5 moles of H20? Show work on how you got the answer please.? How much heat is involved in the condensation of 5.00 L of water? The density of water at 100°C is 0.958 g/mL and ∆H°vap of water is 40.7?