if 250 ml of oxygen at stp are consumed when magnesium burns, how many grams of magnesium oxide? [Mg(s) + O2(g) ---> MgO(s)]

Answer 1

How many mols O2 were consumed? That's 0.250 L x (1 mol/22.4L) = ? mols O2.
Use the coefficients in the balanced equation to convert mols O2 to mols MgO.
Now convert mols MgO to g. g = mols x molar mass.

Answer 2

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