mols O2 = grams/molar mass
Using the coefficients in the balanced equation, convert mols O2 to mols D2O.
Now convert mols D2O to grams. g = mols x molar mass = ?
Consider the reaction
2D2(g)+O2(g)→2D2O(l)
What is the mass of heavy water, D2O(l), produced when 3.75g of O2(g) reacts with excess D2(g)?
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