Question

In the reaction: `A + B -> C`, if 4.2 grams of A react to make 6.8 grams of C, then how many grams of B were reacted?

Answer 1

The mass of `"B"` reacted was 2.6 g.

Explanation:

We can use the Law of Conservation of Mass to solve the problem.

`underbrace("A")_color(red)("4.2 g") + underbrace("B")_color(red)(x) → underbrace("C")_color(red)("6.8 g")`

`"4.2 g"color(white)(l) + x = "6.8 g"`

`x = "6.8 g - 4.2 g" = "2.6 g"`