A chemist reacts 0.2 moles of methanal with an excess of Tollen's reagent in a test tube. What is the total mass of the silver mirror formed?
Q1. A chemist reacts 0.2 moles of methanal with an excess of Tollen's reagent in a test tube. What is the total mass of the silver mirror formed?
Answer: 43.2 g
Explanation: One mole of methanal produces two moles of silver; 0.2 moles yield 0.4 moles (43.2g). 21.6g wrongly assumes a 1:1 ratio.