ANSWERS: 2
  • 4 grams of water. H2O and some free oxygen.
  • The equation is 2 H2 + O2 -> 2 H2O each of those represents one mole of the substance. Molecular oxygen has an atomic weight of 32 grams per mole. Molecular hydrogen has an atomic weight of 2 grams per mole. So the question concerns a quarter of a mole of oxygen, and 4 moles of hydrogen. From the equation a quarter of a mole of oxygen (8g) combines with half a mole of hydrogen (1g) so must create 9g of water. 7g of hydrogen remain.

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