Question

in a chemical reaction, two molecules are rearranged to produce two new molecules. reactant 1 has a mass of 12 g. reactant 2 has a mass of 23 g. the mass of product 1 is 15 g. the mass of product 2 is ______. (1 point) 11 g 27 g 36 g 20 g

Explanation:

Step1: Recall the law of conservation of mass.

The total mass of reactants equals the total mass of products. So, first, calculate the total mass of reactants.
Total mass of reactants = Mass of Reactant 1 + Mass of Reactant 2 = $12\ \text{g} + 23\ \text{g} = 35\ \text{g}$

Step2: Let the mass of Product 2 be $x$.

Total mass of products = Mass of Product 1 + Mass of Product 2 = $15\ \text{g} + x$
By the law of conservation of mass, total mass of reactants = total mass of products.
So, $35\ \text{g} = 15\ \text{g} + x$
Solving for $x$: $x = 35\ \text{g} - 15\ \text{g} = 20\ \text{g}$ (Wait, no, wait. Wait, 12 +23 is 35, 35 -15 is 20? But wait, let me check again. Wait, 12 +23 is 35. Product 1 is 15, so product 2 is 35 -15 = 20? But the options have 20? Wait, the options: 11,27,36,20. Wait, maybe I made a mistake. Wait, 12 +23 is 35. 35 -15 is 20. So the mass of product 2 is 20 g? Wait, but let me check the options again. The options are 11 g, 27 g, 36 g, 20 g. So 20 g is an option. Wait, but maybe I miscalculated. Wait, 12 +23 is 35. 35 -15 is 20. So the answer should be 20 g. Wait, but let me check the problem again. "two molecules are rearranged to produce two new molecules". So reactants: 2 molecules, products: 2 molecules. So mass conservation. So reactant mass: 12 +23 =35. Product mass:15 + x =35. So x=20. So the correct option is 20 g. Wait, but the options have 20 g? Wait, the last option is 20 g? Let me check the image again. The options: 11 g, 27 g, 36 g, 20 g. So yes, 20 g is an option. So the answer is 20 g. Wait, but earlier when I thought 35 -15 is 20, that's correct. So the mass of product 2 is 20 g.

Answer:

20 g (corresponding to the option with "20 g")