Question

10 g of a solid chemical reacts with a 10 g of a liquid chemical, the reaction bubbles and changes the color of the liquid. The colored liquid weighs 13 g, what can be concluded?A. The gas produced from the bubbles weighed 5 gB. The bubbles were evidence of 7 g of matter being destroyedC. The gas produced weighed 7 gD. The gas produced weighed 13 g

Answer 1

A - That can't be the correct one because the math does not fit the whole reaction, if we have 10g of solid + 10g of liquid and 13g of the final solution, we can't have 5g of gas, otherwise we would have 2g missing and according to the Law of Conservation of Mass, whatever comes in as reactant must come out as product;

B - Again, we don't have "matter being destroyed", that does not happen with chemical reactions, and that is the basis for stoichiometry;

C - Correct answer, 13g of solution + 7g of gas = 20g, exactly the sum of liquid and solid;

D - That would make to final sum be 26g, which is more than the sum of the mass of the reactants