Question

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

Explanation:

Step1: Apply the law of conservation of mass

According to the law of conservation of mass, the mass of reactants equals the mass of products in a chemical reaction. So, \(m(A)+m(B)=m(C)\).

Step2: Solve for \(m(B)\)

We know \(m(A) = 5g\) and \(m(C)=9g\). Rearranging the formula from Step 1 gives \(m(B)=m(C)-m(A)\). Substituting the values: \(m(B)=9g - 5g\).

Answer:

\(4g\)