객관식
In the balanced chemical equation for the reaction between acetic acid and sodium carbonate, if the coefficient for sodium acetate (NaC2H3O2) is 2, what is the total number of sodium atoms present in the products side of the equation?
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3. Chemical Reactions
Stoichiometry
Multiple Choice
When 20 mL of 0.80 M HCl is mixed with 30 mL of 0.40 M NaOH, what mass of water (in grams) is formed from the neutralization reaction?
A
0.32 g
B
0.64 g
C
0.48 g
D
0.80 g
검증된 단계별 안내1
Write the balanced chemical equation for the neutralization reaction: \(\mathrm{HCl + NaOH \rightarrow NaCl + H_2O}\).
Calculate the moles of HCl using the formula \(\text{moles} = M \times V\), where \(M\) is molarity and \(V\) is volume in liters. For HCl: \(0.80\,M \times 0.020\,L\).
Calculate the moles of NaOH similarly: \(0.40\,M \times 0.030\,L\).
Determine the limiting reactant by comparing the moles of HCl and NaOH, since the reaction ratio is 1:1.
Calculate the moles of water formed, which equals the moles of the limiting reactant, then convert moles of water to grams using the molar mass of water (\(18.02\,g/mol\)) with the formula \(\text{mass} = \text{moles} \times \text{molar mass}\).
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