# Question #9c2ab

Dec 25, 2017

Chemical reaction mechanisms conserve mass

#### Explanation:

Suppose this reaction:

$N a + \frac{1}{2} C {l}_{2} \to N a C l$

Reactants: Na 23 g; Cl 35.5 g (elemental weights).

It means 23 grams of sodium (1 mol) and 35.5 grams of $C {l}_{2}$ (note that $C {l}_{2}$ has a mass of 71 grams) form 58.5 grams of table salt. Mass is conserved.

When a chemical reaction is written down, it provided both qualitative and quantitative information. Qualitatively we can see which chemicals are interacting to form which end products. Stochiometrically the mass is conserved. In other words, the balancing of equations so that the same number of each kind atom appears on each side of the equation and the subsequent calculations, which could be used to determine amounts of each compound involved.

Dec 25, 2017