Multiple Choice
Given the reaction: Fe3O4 + 4 H2 → 3 Fe + 4 H2O, how many grams of Fe3O4 are required to react completely with 300 grams of H2?
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3. Chemical Reactions
Stoichiometry
Multiple Choice
When 0.066 mole of sodium (Na) is completely reacted with water according to the equation 2 Na + 2 H_2O → 2 NaOH + H_2, how many moles of hydrogen gas (H_2) are produced?
A
0.033 mole
B
0.066 mole
C
0.132 mole
D
0.0165 mole
Verified step by step guidance1
Write down the balanced chemical equation: \[2\ Na + 2\ H_2O \rightarrow 2\ NaOH + H_2\]
Identify the mole ratio between sodium (Na) and hydrogen gas (H_2) from the balanced equation. For every 2 moles of Na, 1 mole of H_2 is produced.
Set up a proportion using the mole ratio to find the moles of hydrogen gas produced from 0.066 moles of sodium: \[\frac{2\ \text{moles Na}}{1\ \text{mole H}_2} = \frac{0.066\ \text{moles Na}}{x\ \text{moles H}_2}\]
Solve for \[x\], the moles of hydrogen gas produced, by cross-multiplying and dividing: \[x = \frac{0.066 \times 1}{2}\]
Interpret the result as the number of moles of hydrogen gas produced when 0.066 moles of sodium react completely with water.
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