Consider the balanced reaction: 4 Na(s) + O2 (g) → 2 Na2O(s) Suppose a reaction vessel initially contains 6.0 mole Na and 6.0 mole O2. What is in the reaction vessel once the reaction has occurred to the fullest extent possible?

Which of the following represents the Lewis structure for S2?

Determine the oxidation number of sulfur (S) in thiosulfate polyatomic ion, S2O32−.

Identify the ionic compound.

A piece of copper with a mass of 75.6 g has an initial temperature of 65.4oC. The piece of copper is immersed in a beaker containing an unknown mass of water at 22.7 C. When the two substances reach thermal equilibrium, the final temperature is 24.2 C. What is the mass of the water, g? Specific heat of Cu = 0.385 J/g ·oC, The specific heat of H2O is 4.184 J/g ·oC

Give the number of valence electrons for CO32-.

What are the coefficients for the following reaction when it is properly balanced?  __Zn(s)+ __HNO3(aq) –>  __Zn(NO3)2 (aq) + __NO2(g) + __H2O(l)

Determine the mass of an object that has a volume of 21.60 mL and a density of 1.98 g/mL. Pay attention to significant figures!

A fixed amount of gas at 25.0°C occupies a volume of 9.80 L when the pressure is 695 torr. Use Boyle’s law to calculate the pressure (atm) when the volume is increased to 15.0 L at the same temperature. 1 atm = 760 torr

What is the molar (M) concentration of phosphate ions (PO43-) in a 725 mL solution containing 155 grams of lead(III) phosphate, Pb3(PO4)4? Molar mass of Pb3(PO4)4 is 1001.4 g/mol