Answer:
Step-by-step explanation:
The balanced chemical equation for the reaction of hydrogen gas (H2) with oxygen gas (O2) to form water (H2O) is:
2H2 + O2 → 2H2O
According to the equation, 2 moles of H2 react with 1 mole of O2 to produce 2 moles of H2O. Therefore, to determine how many water molecules can be made from 7 moles of H2 and 8 moles of O2, we need to determine which reactant is limiting and calculate the amount of product that can be formed based on the limiting reactant.
To do this, we can calculate the moles of H2O that can be produced from each reactant and choose the smaller value as the limiting reactant.
From 7 moles of H2, we can produce:
(7 moles H2) x (2 moles H2O / 2 moles H2) = 7 moles H2O
From 8 moles of O2, we can produce:
(8 moles O2) x (2 moles H2O / 1 mole O2) = 16 moles H2O
Since we can only produce 7 moles of H2O from the H2, but we can produce 16 moles of H2O from the O2, the H2 is the limiting reactant. Therefore, the maximum amount of water molecules that can be produced is:
(7 moles H2) x (2 moles H2O / 2 moles H2) = 7 moles H2O
Finally, we can convert moles of H2O to the number of water molecules by multiplying the moles by Avogadro's number:
(7 moles H2O) x (6.02 x 10^23 molecules/mole) = 4.22 x 10^24 molecules of H2O
Therefore, from 7 moles of H2 and 8 moles of O2, we can make 4.22 x 10^24 water molecules.