Question

in a reaction a + b ---> c, reactant a has 5g and product c has 9g. how many grams should reactant b have? 5g 4g 14g 9g

Explanation:

Step1: Recall Law of Conservation of Mass

In a chemical reaction, mass of reactants = mass of products. So, mass of A + mass of B = mass of C.

Step2: Substitute known values

Given mass of A = 5g, mass of C = 9g. Let mass of B be \( x \). Then \( 5 + x = 9 \).

Step3: Solve for \( x \)

Subtract 5 from both sides: \( x = 9 - 5 = 4 \)g.

Answer:

4g (corresponding to the 4g option)