Multiple Choice
How many grams of oxygen (O2) are needed to completely react with 1.33 g of butyric acid (C4H8O2) in a combustion reaction?
3. Chemical Reactions
Stoichiometry
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How many grams of chlorine gas (Cl2) are needed to react completely with sodium to produce 117 grams of sodium chloride (NaCl)?
A
142 grams
B
35.5 grams
C
71 grams
D
58.5 grams
Verified step by step guidance1
Write the balanced chemical equation for the reaction: 2Na + Cl2 → 2NaCl.
Calculate the molar mass of NaCl using the periodic table: Na (22.99 g/mol) + Cl (35.45 g/mol) = 58.44 g/mol.
Determine the number of moles of NaCl produced using the given mass: moles of NaCl = mass of NaCl / molar mass of NaCl.
Use the stoichiometry of the balanced equation to find the moles of Cl2 needed. According to the equation, 1 mole of Cl2 produces 2 moles of NaCl.
Calculate the mass of Cl2 required using its molar mass (Cl2 = 70.90 g/mol): mass of Cl2 = moles of Cl2 × molar mass of Cl2.
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