The unbalanced equation is: \(\mathbf{SiCl_{4(g)} + Mg_{(s)} \to Si_{(s)} + MgCl_2{(s)}}\)
The balanced equation for is: \(\mathbf{SiCl_{4(g)} + 2Mg_{(s)} \to Si_{(s)} + 2MgCl_2{(s)}}\)
We are being told that the reaction occurs between Silicon tetrachloride gas and Magnesium metal.
This can be expressed as \(\mathbf{SiCl_{4(g)} + Mg_{(s)} }}\)
The reaction between these reactants gives the product of Solid silicon and solid magnesium chloride \(\mathbf{ Si_{(s)} + MgCl_2{(s)}}\)
The unbalanced state of the equation where the moles of the reactant is not equal to the moles of the product is:
\(\mathbf{SiCl_{4(g)} + Mg_{(s)} \to Si_{(s)} + MgCl_2{(s)}}\)
The balanced state of the equation where the number of moles of the reactant is equal to the moles of the product is:
\(\mathbf{SiCl_{4(g)} + 2Mg_{(s)} \to Si_{(s)} + 2MgCl_2{(s)}}\)
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