Question

scarlett is conducting an experiment where she mixes 5g of substance a with another substance b to produce 9g of product c (a + b ---> c). how many grams does reactant b should have?

Explanation:

Step1: Use the law of conservation of mass

According to the law of conservation of mass, in a chemical reaction \(A + B
ightarrow C\), the mass of reactants (\(m_A + m_B\)) is equal to the mass of the product (\(m_C\)). So, \(m_B=m_C - m_A\).

Step2: Substitute the given values

We know that \(m_A = 5g\) and \(m_C=9g\). Substitute these values into the formula \(m_B=m_C - m_A\). Then \(m_B=9g - 5g\).

Answer:

\(4g\)