According to the following reaction, how many grams of potassium hydroxide are required for the complete reaction of 27.9 grams of carbon dioxide?

Question

According to the following reaction, how many grams of potassium hydroxide are required for the complete reaction of 27.9 grams of carbon dioxide?

carbon dioxide (g) + potassium hydroxide (aq)  potassium carbonate (aq) + water (l)

Answer 1

2KOH + CO₂ ==> K₂CO₃ + H₂O ... balanced equation

moles CO₂ present = 27.9 g x 1 mol/44 g = 0.634 moles

mass KOH needed = 0.634 mol CO₂ x 2 mol KOH/mol CO₂ x 56.11g/mol = 71.1 g