Multiple Choice
According to the following reaction, what volume of 0.244 M KCl solution is required to react exactly with 50.0 mL of 0.210 M Pb(NO3)2 solution?
2 KCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 KNO3(aq)
822
views
3. Chemical Reactions
Stoichiometry
Multiple Choice
C7H6O3 + C4H6O3 → C9H8O4 + CH3CO2H. How many grams of salicylic acid (C7H6O3) are needed to produce 11.9 g of aspirin (C9H8O4)?
A
10.00 g
B
5.40 g
C
12.00 g
D
7.20 g
Verified step by step guidance1
Identify the balanced chemical equation for the reaction: C7H6O3 (salicylic acid) + C4H6O3 (acetic anhydride) → C9H8O4 (aspirin) + CH3CO2H (acetic acid).
Determine the molar masses of the compounds involved. Calculate the molar mass of salicylic acid (C7H6O3) and aspirin (C9H8O4) using the atomic masses of carbon (C), hydrogen (H), and oxygen (O).
Use the molar mass of aspirin to convert the given mass of aspirin (11.9 g) to moles. This is done by dividing the mass of aspirin by its molar mass.
According to the balanced equation, the molar ratio of salicylic acid to aspirin is 1:1. Use this ratio to find the moles of salicylic acid needed, which will be equal to the moles of aspirin calculated in the previous step.
Convert the moles of salicylic acid back to grams using its molar mass. Multiply the moles of salicylic acid by its molar mass to find the mass in grams needed to produce 11.9 g of aspirin.
Related Videos
Related Practice
