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QUESTION

Silicon tetrachloride (SiCl_4) can be prepared by heating Si in chlorine gas: Si (s) + 2Cl_2(g) -&gt; SiCl_4(l). In one reaction, 0.507 mole of SiCl_4 is produced. How many moles of molecular chlorine were used in the reaction?

demands at least 1.14 mol of Cl_2 gas.

The stoichiometric equation, which you have correctly written, clearly and explicitly shows that 1 mol of silicon (approx. 28*g) reacts with 2*"moles" of chlorine gas (approx. 71*g) to give 1 mol of SiCl_4.

The equation establishes both the molar and mass balance.