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The chemical reaction of hydrogen with oxygen produces water.2H₂(g) + O₂(g) → 2H₂O(g)c. How many moles of H₂O form when 2.5 moles of O₂ reacts?
6. Chemical Reactions & Quantities
Stoichiometry
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The oxidation of chromium solid is represented by the following equation:
How many moles of chromium (III) oxide are produced when 34.69 g Cr reacts with excess oxygen gas?
A
0.334 mol
B
1.33 mol
C
0.749 mol
D
3.00 mol
E
0.667 mol
Verified step by step guidance1
First, determine the molar mass of chromium (Cr). Chromium has an atomic mass of approximately 51.996 g/mol.
Calculate the number of moles of chromium in 34.69 g using the formula: \( \text{moles of Cr} = \frac{\text{mass of Cr}}{\text{molar mass of Cr}} \).
Using the balanced chemical equation, identify the stoichiometric ratio between chromium and chromium(III) oxide. From the equation, 4 moles of Cr produce 2 moles of Cr2O3.
Use the stoichiometric ratio to calculate the moles of chromium(III) oxide produced. Multiply the moles of chromium by the ratio \( \frac{2 \text{ moles Cr2O3}}{4 \text{ moles Cr}} \).
Finally, compare your calculated moles of chromium(III) oxide with the given options to identify the correct answer.
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