We are given the weight of three chemicals and we are asked to determine the total weight of the three. To do that we will add up each of the given weights:
[tex]M=m_1+m_2+m_3[/tex]
Where:
[tex]\begin{gathered} M=\text{combined weight} \\ m=\text{ weight of each chemical} \end{gathered}[/tex]
Replacing the given values:
[tex]M=0.312g+0.025g+0.48g[/tex]
Solving the operation we get:
[tex]M=0.817g[/tex]
Therefore, the combined weight of the three chemicals is 0.817 grams.
