Multiple Choice
In a solution containing 2.00 × 10^{-2} M Sr^{2+} and 1.50 × 10^{-3} M CrO_4^{2-}, what is the value of the reaction quotient Q for the precipitation of SrCrO_4? (Q = [Sr^{2+}][CrO_4^{2-}])
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3. Chemical Reactions
Stoichiometry
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If you have 41.0 mol of P4O10, how many moles of phosphorus (P) atoms are present?
A
41.0 mol
B
164 mol
C
82.0 mol
D
410 mol
Verified step by step guidance1
Identify the chemical formula given: P4O10. This means each molecule contains 4 phosphorus (P) atoms and 10 oxygen (O) atoms.
Understand that the problem asks for the number of moles of phosphorus atoms present in 41.0 moles of P4O10 molecules.
Use the relationship between moles of compound and moles of atoms: multiply the moles of P4O10 by the number of phosphorus atoms per molecule.
Write the equation: \(\text{moles of P atoms} = \text{moles of P4O10} \times 4\).
Substitute the given value: \(\text{moles of P atoms} = 41.0 \times 4\) to find the total moles of phosphorus atoms.
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