# Chemistry 103

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2NiO(s)→2Ni(s)+O2(g)

If O2 is collected over water at 40.0C and a total pressure of 739mmHg , what volume of gas will be collected for the complete reaction of 24.18g of NiO?

• Chemistry 103 -

mols NiO = 24.18 g NiO/molar mass NiO.
Convert mols NiO to mols O2 using the coefficients in the balanced equation.
Using PV = nRT convert n = mols to volume at the stated conditions.
For pressure, use 739-vapor pressure H2O at 40 C.

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