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How many moles of water are produced when 58 g of oxygen gas (O_2) react completely with excess hydrogen according to the reaction: 2 H_2 + O_2 → 2 H_2O?
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3. Chemical Reactions
Stoichiometry
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If you have 63.5 mol of P_4O_{10}, how many moles of phosphorus atoms (P) are present?
A
127 mol
B
254 mol
C
635 mol
D
63.5 mol
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Identify the chemical formula given: \(P_4O_{10}\). This means each molecule contains 4 phosphorus (P) atoms and 10 oxygen (O) atoms.
Understand that the question asks for the number of moles of phosphorus atoms, not molecules of \(P_4O_{10}\).
Use the relationship between moles of compound and moles of atoms: multiply the moles of \(P_4O_{10}\) by the number of phosphorus atoms per molecule.
Set up the calculation: \(\text{moles of P atoms} = 63.5 \text{ mol } P_4O_{10} \times 4 \frac{\text{mol P}}{\text{mol } P_4O_{10}}\).
Perform the multiplication to find the total moles of phosphorus atoms present.
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